- ID:
- ivo://CDS.VizieR/J/A+A/419/999
- Title:
- Infrared knots along protostellar jets
- Short Name:
- J/A+A/419/999
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the near infrared spectra (0.9-2.5 micron) of protostellar jets (HH 24-26, HH72, BHR71). The observations were carried out with Sofi at R~600 with the 1x290arcsec slit. The spectra are dominated by H2 rovibrational lines (v up 5). Faint emission from ionized material in form of [FeII] and [SII] lines is also recognizable. The tables contain the observed lines together with the measured flux. The reported error derives from the rms of the baseline, multiplied by the width of the instrumental profile (30 Angstrom).
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- ID:
- ivo://CDS.VizieR/J/AJ/137/4072
- Title:
- Infrared photometry of G216-2.5 YSOs
- Short Name:
- J/AJ/137/4072
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The giant molecular cloud G216-2.5, also known as Maddalena's cloud or the Maddalena-Thaddeus cloud, is distinguished by an unusual combination of high gas mass (1-6x10^5^_M{sun}), low kinetic temperatures (10K), and the lack of bright far-IR emission. Although star formation has been detected in neighboring satellite clouds, little evidence for star formation has been found in the main body of this cloud. Using a combination of mid-IR observations with the IRAC and Multiband Imaging Photometer for Spitzer instruments onboard the Spitzer Space Telescope, and near-IR images taken with the Flamingos camera on the KPNO 2.1m telescope, we identify a population of 41 young stars with disks and 33 protostars in the center of the cloud. Most of the young stellar objects are coincident with a filamentary structure of dense gas detected in CS (2->1). These observations show that the main body of G216 is actively forming stars, although at a low stellar density comparable to that found in the Taurus cloud.
- ID:
- ivo://CDS.VizieR/J/ApJ/818/59
- Title:
- IN-SYNC. IV. YSOs in Orion A
- Short Name:
- J/ApJ/818/59
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of the Sloan Digital Sky Survey APOGEE INfrared Spectroscopy of Young Nebulous Clusters program (IN-SYNC) survey of the Orion A molecular cloud. This survey obtained high-resolution near-infrared spectroscopy of about 2700 young pre-main-sequence stars on a ~6{deg} field of view. We have measured accurate stellar parameters (T_eff_, logg, vsini) and extinctions and placed the sources in the Hertzsprung-Russel diagram (HRD). We have also extracted radial velocities for the kinematic characterization of the population. We compare our measurements with literature results to assess the performance and accuracy of the survey. Source extinction shows evidence for dust grains that are larger than those in the diffuse interstellar medium: we estimate an average R_V_=5.5 in the region. Importantly, we find a clear correlation between HRD inferred ages and spectroscopic surface-gravity-inferred ages and between extinction and disk presence; this strongly suggests a real spread of ages larger than a few Myr. Focusing on the young population around NGC 1980/{iota} Ori, which has previously been suggested to be a separate, foreground, older cluster, we confirm its older (~5Myr) age and low A_V_, but considering that its radial velocity distribution is indistinguishable from Orion A's population, we suggest that NGC 1980 is part of Orion A's star formation activity. Based on their stellar parameters and kinematic properties, we identify 383 new candidate members of Orion A, most of which are diskless sources in areas of the region poorly studied by previous works.
- ID:
- ivo://CDS.VizieR/J/A+A/572/A63
- Title:
- Intensity maps in the star-forming complex W33
- Short Name:
- J/A+A/572/A63
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The object W33 is a giant molecular cloud that contains star forming regions at various evolutionary stages from quiescent clumps to developed HII regions. Since its star forming regions are located at the same distance and the primary material of the birth clouds is probably similar, we conducted a comparative chemical study to trace the chemical footprint of the different phases of evolution. We observed six clumps in W33 with the Atacama Pathfinder Experiment (APEX) telescope at 280GHz and the Submillimeter Array (SMA) at 230GHz. We detected 27 transitions of 10 different molecules in the APEX data and 52 transitions of 16 different molecules in the SMA data. The chemistry on scales larger than ~0.2pc, which are traced by the APEX data, becomes more complex and diverse the more evolved the star forming region is. On smaller scales traced by the SMA data, the chemical complexity and diversity increase up to the hot core stage. In the HII region phase, the SMA spectra resemble the spectra of the protostellar phase. Either these more complex molecules are destroyed or their emission is not compact enough to be detected with the SMA. Synthetic spectra modelling of the H_2_CO transitions, as detected with the APEX telescope, shows that both a warm and a cold component are needed to obtain a good fit to the emission for all sources except for W33 Main1. The temperatures and column densities of the two components increase during the evolution of the star forming regions. The integrated intensity ratios N_2_H^+^(3-2)/CS(6-5) and N_2_H^+^(3-2)/H_2_CO(4_2,2_-3_2,1_) show clear trends as a function of evolutionary stage, luminosity, luminosity-to-mass ratio, and H_2_ peak column density of the clumps and might be usable as chemical clocks.
- ID:
- ivo://CDS.VizieR/J/AJ/131/1501
- Title:
- Intermediate-velocity clouds in the CGPS
- Short Name:
- J/AJ/131/1501
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present observations of intermediate-velocity clouds (IVCs) found at positive velocities in the Canadian Galactic Plane Survey Phase I region (74{deg}<l<148{deg},-3.5{deg}<b<+5.6{deg}). A catalog of 138 distinct IVCs and 13 IVC complexes has been compiled.
- ID:
- ivo://CDS.VizieR/J/A+A/441/181
- Title:
- Interstellar ^12^C/^13^C ratios
- Short Name:
- J/A+A/441/181
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The ^12^C/^13^C isotope ratio is a tracer of stellar yields and the efficiency of mixing in the ISM. ^12^CH^+^/^13^CH^+^ is not affected by interstellar chemistry, and is the most secure way of measuring ^12^C/^13^C in the diffuse ISM. R=^12^C/^13^C is 90 in the solar system. Previous measurements of ^12^CH 3957.7,4232.3 and ^13^CH 3958.2,4232.0 absorption toward nearby stars indicate some variations in ^12^C/^13^C, with values ranging from 40 to 90 suggesting inefficient mixing. Except for the cloud toward Oph, these R values are strongly affected by noise. With UVES on the VLT we have improved on the previous interstellar ^12^C/^13^C measurements. ************************************************************************** * * * Sorry, but the author(s) never supplied the tabular material * * announced in the paper * * * **************************************************************************
- ID:
- ivo://CDS.VizieR/J/A+A/411/447
- Title:
- Interstellar NaI D-line
- Short Name:
- J/A+A/411/447
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present intermediate results from a long-term program of mapping the neutral absorption characteristics of the local interstellar medium, motivated by the availability of accurate and consistent parallaxes from the Hipparcos satellite. Equivalent widths of the interstellar NaI D-line doublet at 5890{AA} are presented for the lines-of-sight towards some 311 new target stars lying within ~350pc of the Sun. Using these data, together with NaI absorption measurements towards a further ~240 nearby targets published in the literature (for many of them, in the directions of molecular clouds), and the ~450 lines-of-sight already presented by (Sfeir et al., 1999, Cat. <J/A+A/346/785>), we show 3D absorption maps of the local distribution of neutral gas towards 1005 sight-lines with Hipparcos distances as viewed from a variety of different galactic projections. The data are synthesized by means of two complementary methods, (i) by mapping of iso-equivalent width contours, and (ii) by density distribution calculation from the inversion of column-densities, a method devised by Vergely et al. (2001A&A...366.1016V). Our present data confirms the view that the local cavity is deficient in cold and neutral interstellar gas. The closest dense and cold gas "wall", in the first quadrant, is at ~55-60pc. There are a few isolated clouds at closer distance, if the detected absorption is not produced by circumstellar material. The observations were obtained during 11 observing runs over the period 1998-2000.
- ID:
- ivo://CDS.VizieR/J/ApJ/675/1375
- Title:
- IRAC/MIPS photometry in Cha I
- Short Name:
- J/ApJ/675/1375
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a census of circumstellar disks in the Chamaeleon I star-forming region. Using the Infrared Array Camera and the Multiband Imaging Photometer on board the Spitzer Space Telescope, we have obtained images of Chamaeleon I at 3.6, 4.5, 5.8, 8.0, and 24um. To search for new disk-bearing members of the cluster, we have performed spectroscopy on objects that have red colors in these data. Through this work, we have discovered four new members of Chamaeleon I with spectral types of M4, M6, M7.5, and L0.
- ID:
- ivo://CDS.VizieR/J/ApJ/719/9
- Title:
- IRAC point-source catalog of Vela-D cloud
- Short Name:
- J/ApJ/719/9
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This paper presents the observations of Cloud D in the Vela Molecular Ridge, obtained with the Infrared Array Camera (IRAC) camera on board the Spitzer Space Telescope at the wavelengths {lambda}=3.6, 4.5, 5.8, and 8.0um. A photometric catalog of point sources, covering a field of approximately 1.2deg^2^, has been extracted and complemented with additional available observational data in the millimeter region. Previous observations of the same region, obtained with the Spitzer MIPS camera in the photometric bands at 24um and 70um, have also been reconsidered to allow an estimate of the spectral slope of the sources in a wider spectral range. A total of 170299 point sources, detected at the 5{sigma} sensitivity level in at least one of the IRAC bands, have been reported in the catalog. There were 8796 sources for which good quality photometry was obtained in all four IRAC bands. For this sample, a preliminary characterization of the young stellar population based on the determination of spectral slope is discussed; combining this with diagnostics in the color-magnitude and color-color diagrams, the relative population of young stellar objects (YSOs) in different evolutionary classes has been estimated and a total of 637 candidate YSOs have been selected.
- ID:
- ivo://CDS.VizieR/J/A+A/560/A24
- Title:
- IRAM 30m CO-observations in W43
- Short Name:
- J/A+A/560/A24
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We observed molecular clouds in the giant star forming region W43. For this project we used the IRAM 30m telescope to observe the molecular emission lines ^13^CO (2-1) and C^18^O (2-1), that trace the mid-density (n~10^3^cm^-3^) molecular gas. The lines were observed with the HERA receiver and the VESPA backend. At the observed frequencies the IRAM 30m has a beam size of 11.7". We include two FITS files containing the data-cubes (pos-pos-vel) of the ^13^CO and C^18^O emission lines of the W43 complex. We used equatorial coordinates for the spatial dimensions and v_lsr_ for the spectral dimension. The pixel size is 5.9" in spatial dimension and the spectral resolution is 0.16km/s. All values are in K. The data-cubes span an area of about 1x1.5{deg} (RAxDec) around the center of the maps at 18:46:54.4 -02:14:11 (EQ=J2000) and the velocity range from 30 to 130km/s and include the complete W43 complex and several fore- and background clouds.
