- ID:
- ivo://CDS.VizieR/J/A+A/598/A79
- Title:
- 10 Leo in YJ, H, K, L and M bands spectra
- Short Name:
- J/A+A/598/A79
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- High resolution stellar spectral atlases are valuable resources to astronomy. They are rare in the 1-5{mu}m region for historical reasons, but once available, high resolution atlases in this part of the spectrum will aid the study of a wide range of astrophysical phenomena. The aim of the CRIRES-POP project is to produce a high resolution near-infrared spectral library of stars across the H-R diagram. The aim of this paper is to present the fully reduced spectrum of the K giant 10 Leo that will form the basis of the first atlas within the CRIRES-POP library, to provide a full description of the data reduction processes involved, and to provide an update on the CRIRES-POP project. All CRIRES-POP targets were observed with almost 200 different observational settings of CRIRES on the ESO Very Large Telescope, resulting in a basically complete coverage of its spectral range as accessible from the ground. We reduced the 10 Leo spectra with the CRIRES pipeline, corrected the wavelength solution and removed telluric absorption with Molecfit, then resampled the spectra to a common wavelength scale, shifted to rest wavelengths, flux normalised, and median combined them into one final data product. We present the fully reduced, high resolution, near-infrared spectrum of 10 Leo. This is also the first complete spectrum from the CRIRES instrument. The spectrum is available online. The first CRIRES-POP spectrum has exceeded our quality expectations and will form the centre of a state-of-the-art stellar atlas. This first CRIRES-POP atlas will soon be available, and further atlases will follow. All CRIRES-POP data products will be freely and publicly available online.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/A+A/593/A112
- Title:
- LHA 120-S 73 optical and NIR spectra
- Short Name:
- J/A+A/593/A112
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- B[e] supergiants are evolved massive stars, enshrouded in a dense wind and surrounded by a molecular and dusty disk. The mechanisms that drive phases of enhanced mass loss and mass ejections, responsible for the shaping of the circumstellar material of these objects, are still unclear. We aim to improve our knowledge on the structure and dynamics of the circumstellar disk of the Large Magellanic Cloud B[e] supergiant LHA 120-S 73. High-resolution optical and near-infrared spectroscopic data were obtained over a period of 16 and 7 yr, respectively. The spectra cover the diagnostic emission lines from [CaII] and [OI], as well as the CO bands. These features trace the disk at different distances from the star. We analyzed the kinematics of the individual emission regions by modeling their emission profiles. A low-resolution mid-infrared spectrum was obtained as well, which provides information on the composition of the dusty disk.
- ID:
- ivo://CDS.VizieR/J/A+A/562/A92
- Title:
- Li abundance in solar analogues
- Short Name:
- J/A+A/562/A92
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We want to study the effects of the formation of planets and planetary systems on the atmospheric Li abundance of planet host stars. In this work we present new determinations of lithium abundances for 326 main sequence stars with and without planets in the Teff range 5600-5900K. The 277 stars come from the HARPS sample, the remaining targets were observed with a variety of high-resolution spectrographs.
- ID:
- ivo://CDS.VizieR/J/A+A/442/1127
- Title:
- Library of 2500-10500{AA} synthetic spectra
- Short Name:
- J/A+A/442/1127
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a complete library of synthetic spectra based on Kurucz's codes that covers the 2500-10500{AA} wavelength range at resolving powers R_P_=20000, 11500 (=GAIA), 8500 (=RAVE), 2000 (=SLOAN) and uniform dispersions of 1 and 10 {AA}/pix. The library maps the whole HR diagram, exploring 51288 combinations of atmospheric parameters spanning the ranges: 3500<=T_eff_<=47500K, 0.0<=logg<=5.0, -2.5<=[M/H]<=0.5, [{alpha}/Fe]=0.0,+0.4, {xi}=1, 2, 4km/s, 0<=V_rot_<=500km/s. The spectra are available both as absolute fluxes as well as continuum normalized. Performance tests and spectroscopic applications of the library are discussed, including automatic classification of data from spectroscopic surveys like RAVE, SLOAN, GAIA. The entire library of synthetic spectra is accessible via the web.
- ID:
- ivo://CDS.VizieR/J/A+AS/133/221
- Title:
- Library of ELODIE spectra (F5-K7 stars)
- Short Name:
- J/A+AS/133/221
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A library of 211 echelle spectra taken with ELODIE at the Observatoire de Haute-Provence is proposed. It provides a set of spectroscopic standards covering the full range of gravities and metallicities in the effective temperature interval [4000K, 6300K]. The spectra are straightened, wavelength calibrated, cleaned of cosmic ray hits, bad pixels and telluric lines. They cover the spectral range [440nm, 680nm] with an instrumental resolution of 42000. For each star, basic data were compiled from the Hipparcos catalogue (Cat. <I/239>) and the Hipparcos Input Catalogue (Cat. <I/196>) (Table 1). Radial velocities with a precision better than 100m/s are given. Atmospheric parameters Teff, logg, [Fe/H] from the literature are discussed. Because of scattered determinations in the bibliography, even for the most well-known stars, these parameters were adjusted by an iterative process which takes account of common or different spectral features between the standards, using our homogeneous set of spectra. Revised values of effective temperature, gravity and metallicity are proposed in Table 1. They are still consistent with the literature, and also lead to the self-consistency of the library, in the sense that similar spectra have similar atmospheric parameters. This adjustment was performed by using step by step a method based on the least square comparison of carefully prepared spectra, which was originally developed for the on-line estimation of the atmospheric parameters of faint field stars (Katz et al., 1998A&A...338..151K. Paper I.).
- ID:
- ivo://CDS.VizieR/J/ApJS/123/283
- Title:
- Library of FOE spectra of late-type stars
- Short Name:
- J/ApJS/123/283
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a library of Penn State Fiber Optic Echelle (FOE) observations of a sample of field stars with spectral types F to M and luminosity classes V to I. The spectral coverage is from 3800 to 10000{AA} with a nominal resolving power of 12,000. These spectra include many of the spectral lines most widely used as optical and near-infrared indicators of chromospheric activity such as the Balmer lines (H{alpha} to H{delta}), Ca II H & K, the Mg I b triplet, Na I D_1_, D_2_, He I D_3_, and Ca II IRT lines. There are also a large number of photospheric lines, which can also be affected by chromospheric activity, and temperature-sensitive photospheric features such as TiO bands. The spectra have been compiled with the goal of providing a set of standards observed at medium resolution. We have extensively used such data for the study of active chromosphere stars by applying a spectral subtraction technique. However, the data set presented here can also be utilized in a wide variety of ways ranging from radial velocity templates to study of variable stars and stellar population synthesis. This library can also be used for spectral classification purposes and determination of atmospheric parameters (T_eff_, logg, [Fe/H]). A digital version of all the fully reduced spectra is available via ftp and the World Wide Web (WWW) in FITS format.
- ID:
- ivo://CDS.VizieR/J/A+AS/146/217
- Title:
- Library of Spectra (0.5 to 2.5um) of Cool Stars
- Short Name:
- J/A+AS/146/217
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The present catalogue contains 182 low resolution optical spectra, 145 medium resolution (R~1100) near-IR spectra, and 112 merged optical+near-IR spectra that range from about 510 to 2450 nm. The observed stars are luminous cool objects: the sample includes red giants, red supergiants, oxygen rich and carbon rich long period variables (asymptotic giant branch stars), as well as a few Galactic Bulge and LMC/SMC stars. The optical data were acquired on the so-called 74 inch Telescope at Mount Stromlo Observatory. The near-IR data were acquired with the Cryogenic Array Spectrometer and Imager CASPIR on the 2.3 meter Australian National University Telescope at Siding Spring Observatory. Optical and near-IR data for variable objects have been merged only when both were taken less than 15 days apart; but both spectral ranges are also provided separately. The spectra are corrected for telluric absorption. However, in regions where the transmission of the Earth atmosphere is close to zero the fluxes recovered remain highly uncertain. The flux calibration is based on a series of reference stars, for which a theoretical intrinsic energy distribution was assumed. An absolute flux calibration (to about 10% accuracy) was only achieved in exceptional cases; in the other cases, the absolute fluxes can be off their real values by an order of magnitude due to slit losses (for the programme star and/or the reference star) and to non-photometric wheather. Uncertainties in the relative values of fluxes along each spectrum are described in the paper.
- ID:
- ivo://CDS.VizieR/J/A+AS/128/485
- Title:
- Library of UES spectra late-type stars
- Short Name:
- J/A+AS/128/485
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a library of Utrecht echelle spectrograph (UES) observations of a sample of F, G, K and M field dwarf stars covering the spectral range from 4800{AA} to 10600{AA} with a resolution of 55000. These spectra include some of the spectral lines most widely used as optical and near-infrared indicators of chromospheric activity such as H{beta}, MgI b triplet, NaI D{1}, D{2}, HeI D{3}, H{alpha}, and CaII IRT lines, as well as a large number of photospheric lines which can also be affected by chromospheric activity. The spectra have been compiled with the aim of providing a set of standards observed at high-resolution to be used in the application of the spectral subtraction technique to obtain the active-chromosphere contribution to these lines in chromospherically active single and binary stars. This library can also be used for spectral classification purposes. A digital version with all the spectra is available via ftp and the World Wide Web (WWW) (http://www.ucm.es/OTROS/Astrof/fgkmsl/UESfgkmsl.html) in FITS format.
- ID:
- ivo://CDS.VizieR/J/AJ/159/90
- Title:
- Li, C and O abundances of FGK stars
- Short Name:
- J/AJ/159/90
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Abundances of lithium, carbon, and oxygen have been derived using spectral synthesis for a sample of 249 bright F, G, and K Northern Hemisphere dwarf stars from the high-resolution spectra acquired with the Vilnius University Echelle Spectrograph (VUES) at the Moletai Astronomical Observatory of Vilnius University. The sample stars have metallicities, effective temperatures, and ages between -0.7-0.4dex, 5000-6900K, 1-12Gyr, accordingly. We confirm a so far unexplained lithium abundance decrease at supersolar metallicities --A(Li) in our sample stars, which drop by 0.7dex in the [Fe/H] range from +0.10 to +0.55dex. Furthermore, we identified stars with similar ages, atmospheric parameters, and rotational velocities, but with significantly different lithium abundances, which suggests that additional specific evolutionary factors should be taken into account while interpreting the stellar lithium content. Nine stars with predominantly supersolar metallicities, i.e., about 12% among 78 stars with C and O abundances determined, have the C/O number ratios larger than 0.65, thus may form carbon-rich rocky planets. Ten planet-hosting stars, available in our sample, do not show a discernible difference from the stars with no planets detected regarding their lithium content.
- ID:
- ivo://CDS.VizieR/J/ApJS/217/26
- Title:
- Lick AGN monitoring 2011: light curves
- Short Name:
- J/ApJS/217/26
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In the Spring of 2011 we carried out a 2.5 month reverberation mapping campaign using the 3m Shane telescope at Lick Observatory, monitoring 15 low-redshift Seyfert 1 galaxies. This paper describes the observations, reductions and measurements, and data products from the spectroscopic campaign. The reduced spectra were fitted with a multicomponent model in order to isolate the contributions of various continuum and emission-line components. We present light curves of broad emission lines and the active galactic nucleus (AGN) continuum, and measurements of the broad H{beta} line widths in mean and rms spectra. For the most highly variable AGNs we also measured broad H{beta} line widths and velocity centroids from the nightly spectra. In four AGNs exhibiting the highest variability amplitudes, we detect anticorrelations between broad H{beta} width and luminosity, demonstrating that the broad-line region "breathes" on short timescales of days to weeks in response to continuum variations. We also find that broad H{beta} velocity centroids can undergo substantial changes in response to continuum variations; in NGC 4593, the broad H{beta} velocity shifted by ~250km/s over a 1 month period. This reverberation-induced velocity shift effect is likely to contribute a significant source of confusion noise to binary black hole searches that use multi-epoch quasar spectroscopy to detect binary orbital motion. We also present results from simulations that examine biases that can occur in measurement of broad-line widths from rms spectra due to the contributions of continuum variations and photon-counting noise.
