- ID:
- ivo://CDS.VizieR/J/MNRAS/426/2063
- Title:
- SMC RR Lyrae Fourier decomposition
- Short Name:
- J/MNRAS/426/2063
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have performed the Fourier decomposition analysis of 8- and 13-yr V-band light curves of a carefully selected sample of 454 fundamental-mode RR Lyrae variables (RRab type), detected in an ~=14 square degree area of the Small Magellanic Cloud (SMC) and listed in the Optical Gravitational Lensing Experiment, phase III, Catalogue of Variable Stars. The Fourier decomposition parameters were used to derive metal abundances and distance moduli, following the methodology described by Kapakos, Hatzidimitriou & Soszynski, Paper I (2011, Cat. J/MNRAS/415/1366).
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/ApJ/789/104
- Title:
- SNe IIn observations and properties
- Short Name:
- J/ApJ/789/104
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- There is a growing number of Type IIn supernovae (SNe) which present an outburst prior to their presumably final explosion. These precursors may affect the SN display, and are likely related to poorly charted phenomena in the final stages of stellar evolution. By coadding Palomar Transient Factory (PTF) images taken prior to the explosion, here we present a search for precursors in a sample of 16 Type IIn SNe. We find five SNe IIn that likely have at least one possible precursor event (PTF 10bjb, SN 2010mc, PTF 10weh, SN 2011ht, and PTF 12cxj), three of which are reported here for the first time. For each SN we calculate the control time. We find that precursor events among SNe IIn are common: at the one-sided 99% confidence level, >50% of SNe IIn have at least one pre-explosion outburst that is brighter than 3x10^7^ L_{sun}_ taking place up to 1/3 yr prior to the SN explosion. The average rate of such precursor events during the year prior to the SN explosion is likely >~ 1/yr, and fainter precursors are possibly even more common. Ignoring the two weakest precursors in our sample, the precursors rate we find is still on the order of one per year. We also find possible correlations between the integrated luminosity of the precursor and the SN total radiated energy, peak luminosity, and rise time. These correlations are expected if the precursors are mass-ejection events, and the early-time light curve of these SNe is powered by interaction of the SN shock and ejecta with optically thick circumstellar material.
- ID:
- ivo://CDS.VizieR/J/ApJ/807/169
- Title:
- SN IIn catalog with Fermi LAT
- Short Name:
- J/ApJ/807/169
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Supernovae (SNe) exploding in a dense circumstellar medium (CSM) are hypothesized to accelerate cosmic rays in collisionless shocks and emit GeV {gamma}-rays and TeV neutrinos on a timescale of several months. We perform the first systematic search for {gamma}-ray emission in Fermi Large Area Telescope data in the energy range from 100MeV to 300GeV from the ensemble of 147 SNe Type IIn exploding in a dense CSM. We search for a {gamma}-ray excess at each SNe location in a one-year time window. In order to enhance a possible weak signal, we simultaneously study the closest and optically brightest sources of our sample in a joint-likelihood analysis in three different time windows (1 year, 6 months, and 3 months). For the most promising source of the sample, SN 2010jl (PTF 10aaxf), we repeat the analysis with an extended time window lasting 4.5 years. We do not find a significant excess in {gamma}-rays for any individual source nor for the combined sources and provide model-independent flux upper limits for both cases. In addition, we derive limits on the {gamma}-ray luminosity and the ratio of {gamma}-ray-to-optical luminosity ratio as a function of the index of the proton injection spectrum assuming a generic {gamma}-ray production model. Furthermore, we present detailed flux predictions based on multi-wavelength observations and the corresponding flux upper limit at a 95% confidence level (CL) for the source SN 2010jl (PTF 10aaxf).
- ID:
- ivo://CDS.VizieR/J/other/PASAu/10.140
- Title:
- Southern radio sources catalog
- Short Name:
- J/other/PASAu/10
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A list of 900 radio sources with positional accuracies better than 0.5" has been prepared from seventeen lists of radio source positions found in the literature. This compilation includes all such sources south of declination +48{deg} (the northern declination limit of the Compact Array of the Australia Telescope National Facility). Where available, optical identifications, optical magnitudes and redshifts are given as well as total-power flux densities.
- ID:
- ivo://CDS.VizieR/J/A+A/620/A145
- Title:
- Space photometry of the Be stars nu Pup
- Short Name:
- J/A+A/620/A145
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Photometry of the bright Be star {nu} Puppis. The observations were obtained with the Solar Mass Ejection Imager (SMEI) and BRITE-Constellation satellites. Several closely but probably not perfectly evenly spaced frequencies are found that are attributed to nonradial pulsations.
- ID:
- ivo://CDS.VizieR/J/AJ/117/2511
- Title:
- Speckle interferometry at USNO. III
- Short Name:
- J/AJ/117/2511
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Position angles and separations resulting from 2578 speckle interferometric observations of 590 binary stars are tabulated. This is the third in a series of papers presenting measures obtained using the 66 cm refractor at the US Naval Observatory in Washington, DC, and covers the period from 1995 June through 1996 December. Program stars range in separation from 0.2" to 4.3", with a limiting magnitude of V=11. Random errors are estimated to be 17.0mas in separation and 0.56{deg}/{rho} in position angle, where {rho} is the separation in arcseconds. These are the first results acquired using an improved intensified CCD detector. The new detector, in concert with an intensity-filtering technique applied in software, has permitted a 1mag increase in dynamic range, to 3.5mag, for pairs separated by about 2". The instrumentation and calibration are briefly described, with an emphasis on the characteristics of the new detector. The software filter used to increase the dynamic range is also described.
- ID:
- ivo://CDS.VizieR/J/AJ/118/1395
- Title:
- Speckle interferometry at USNO. IV.
- Short Name:
- J/AJ/118/1395
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of 1314 speckle interferometric observations of 625 binary stars, ranging in separation from 0.2" to 5.2" with a limiting secondary magnitude of V=11, are tabulated. These observations were obtained using the 66cm refractor at the US Naval Observatory in Washington, DC, with an intensified CCD detector. This is the fourth in a series of papers presenting measures obtained with this equipment and covers the period 1997 January 1 through December 31. Random errors for all measures are estimated to be 18mas in separation and 0.57{deg}/{rho} in position angle, where {rho} is the separation in arcseconds.
- ID:
- ivo://CDS.VizieR/J/AJ/119/3071
- Title:
- Speckle interferometry at USNO. V.
- Short Name:
- J/AJ/119/3071
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of 1544 speckle interferometric observations of 637 binary stars, ranging in separation from 0.25" to 5.25", are tabulated. These observations were obtained using the 66 cm refractor at the US Naval Observatory in Washington, DC, with an intensified CCD detector. This is the fifth in a series of papers presenting measures obtained with this system and covers the period 1998 January 1 through December 31. Random errors for all measures are estimated to be 17.6 mas in separation and 0.55{deg}/{rho} in position angle, where {rho} is the separation in arcseconds.
- ID:
- ivo://CDS.VizieR/J/AJ/120/1120
- Title:
- Speckle interferometry at USNO. VI.
- Short Name:
- J/AJ/120/1120
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of 1068 speckle interferometric observations of double stars, made with the 26 inch (0.66 m) refractor of the US Naval Observatory, are presented. These observations are averaged into 841 means of 815 binary stars. The systems range in separation from 0.22" to 6.01" with a mean separation of 2.21" and have a limiting secondary magnitude of V=12.5. This is the sixth in a series of papers presenting measures obtained with this system, and it covers the period 1999 January 1 through 2000 January 9.
- ID:
- ivo://CDS.VizieR/J/AJ/142/19
- Title:
- Speckle observations of KOI
- Short Name:
- J/AJ/142/19
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the first results from a speckle imaging survey of stars classified as candidate exoplanet host stars discovered by the Kepler mission. We use speckle imaging to search for faint companions or closely aligned background stars that could contribute flux to the Kepler light curves of their brighter neighbors. Background stars are expected to contribute significantly to the pool of false positive candidate transiting exoplanets discovered by the Kepler mission, especially in the case that the faint neighbors are eclipsing binary stars. Here, we describe our Kepler follow-up observing program, the speckle imaging camera used, our data reduction, and astrometric and photometric performance. Kepler stars range from R=8 to 16 and our observations attempt to provide background non-detection limits 5-6mag fainter and binary separations of ~0.05-2.0-arcsec. We present data describing the relative brightness, separation, and position angles for secondary sources, as well as relative plate limits for non-detection of faint nearby stars around each of 156 target stars. Faint neighbors were found near 10 of the stars.
