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Start Over Subject carbon stars Publisher CDS
61. Evolved stars in the MSX survey
ID:
ivo://CDS.VizieR/J/A+A/431/565
Title:
Evolved stars in the MSX survey
Short Name:
J/A+A/431/565
Date:
21 Oct 2021
Publisher:
CDS
Description:
We investigate the evolution of oxygen- and carbon-rich AGB stars, post-AGB objects, and planetary nebulae using data collected mainly from the MSX catalogue. Magnitudes and colour indices are compared with those calculated from a grid of synthetic spectra that describe the post-AGB evolution beginning at the onset of the superwind.
62. Exploring the SDSS data set. I. EMP & CV stars
ID:
ivo://CDS.VizieR/J/ApJS/228/19
Title:
Exploring the SDSS data set. I. EMP & CV stars
Short Name:
J/ApJS/228/19
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the results of a search for extremely metal-poor (EMP), carbon-enhanced metal-poor (CEMP), and cataclysmic variable (CV) stars using a new exploration tool based on linked scatter plots (LSPs). Our approach is especially designed to work with very large spectrum data sets such as the SDSS, LAMOST, RAVE, and Gaia data sets, and it can be applied to stellar, galaxy, and quasar spectra. As a demonstration, we conduct our search using the SDSS DR10 data set. We first created a 3326-dimensional phase space containing nearly 2 billion measures of the strengths of over 1600 spectral features in 569738 SDSS stars. These measures capture essentially all the stellar atomic and molecular species visible at the resolution of SDSS spectra. We show how LSPs can be used to quickly isolate and examine interesting portions of this phase space. To illustrate, we use LSPs coupled with cuts in selected portions of phase space to extract EMP stars, CEMP stars, and CV stars. We present identifications for 59 previously unrecognized candidate EMP stars and 11 previously unrecognized candidate CEMP stars. We also call attention to 2 candidate He II emission CV stars found by the LSP approach that have not yet been discussed in the literature.
63. Faint carbon stars in 90<l<115, |b|<5
ID:
ivo://CDS.VizieR/J/other/Ap/31.714
Title:
Faint carbon stars in 90<l<115, |b|<5
Short Name:
J/other/Ap/31.71
Date:
21 Oct 2021
Publisher:
CDS
Description:
A low dispersion spectral survey (1250{AA}/mm near H{gamma}) made with the 70-cm meniscus telescope in the region 90{deg}<=l<=115{deg}, -5{deg}<=b<=+5{deg} has led to the discovery of 267 carbon stars, 146 of which have been found for the first time. The distribution of the carbon stars in the investigated region with respect to latitude and longitude is uniform, and they have a Poisson surface distribution. The "nearest-neighbor" method shows that there is no excess of pairs of carbon stars or possible members of star clusters above their mathematical expectation.
64. Faint high-latitude carbon stars SDSS photometry
ID:
ivo://CDS.VizieR/J/AJ/124/1651
Title:
Faint high-latitude carbon stars SDSS photometry
Short Name:
J/AJ/124/1651
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the discovery of 39 faint high-latitude carbon stars (FHLCs) from Sloan Digital Sky Survey (SDSS) commissioning data. The objects, each selected photometrically and verified spectroscopically, range over 16.6<r*<20.0 and show a diversity of temperatures as judged by both colors and NaD line strengths. Although a handful of these stars were previously known, these objects are, in general, too faint and too warm to be effectively identified in other modern surveys such as the Two Micron All Sky Survey, nor are their red/near-IR colors particularly distinctive. We present proper-motion measures for each object, indicating that the sample is a mixture of extremely distant (greater than 100kpc) halo giant stars, useful for constraining halo dynamics, and members of the recently recognized exotic class of very nearby dwarf carbon (dC) stars.
65. Faint high-latitude carbon stars SDSS photometry
ID:
ivo://CDS.VizieR/J/AJ/127/2838
Title:
Faint high-latitude carbon stars SDSS photometry
Short Name:
J/AJ/127/2838
Date:
21 Oct 2021
Publisher:
CDS
Description:
A search of more than 3000deg^2^ of high-latitude sky by the Sloan Digital Sky Survey has yielded 251 faint high-latitude carbon stars (FHLCs), the large majority previously uncatalogued. We present homogeneous spectroscopy, photometry, and astrometry for the sample. The objects lie in the 15.6<r<20.8 range and exhibit a wide variety of apparent photospheric temperatures, ranging from spectral types near M to as early as F. Proper-motion measurements for 222 of the objects show that at least 50%, and quite probably more than 60%, of these objects are actually low-luminosity dwarf carbon (dC) stars, in agreement with a variety of recent, more limited investigations that show that such objects are the numerically dominant type of star with C_2_ in the spectrum. This SDSS homogeneous sample of ~110 dC stars now constitutes 90% of all known carbon dwarfs and will grow by another factor of 2-3 by the completion of the survey. As the spectra of the dC and the faint halo giant C stars are very similar (at least at spectral resolution of 10^3^), despite a difference of 10mag in luminosity, it is imperative that simple luminosity discriminants other than proper motion be developed. We use our enlarged sample of FHLCs to examine a variety of possible luminosity criteria, including many previously suggested, and find that, with certain important caveats, JHK photometry may segregate dwarfs and giants.
66. FBS 15th list of late M and carbon stars
ID:
ivo://CDS.VizieR/J/other/Ap/53.123
Title:
FBS 15th list of late M and carbon stars
Short Name:
J/other/Ap/53.12
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the fifteenth list of faint late M and Carbon type stars detected on the Digitized First Byurakan Survey (DFBS) spectral plates in the zone with +45{deg}<={delta}<=+49{deg} covering 678.4{deg}^2^. Accurate DSS2 positions, USNO-B1.0 B, R, and I magnitudes, 2MASS near-infrared J, H, and Ks photometry, IRAS PSC/FSC fluxes (when available), approximate spectral types and luminosity class estimations are given for 72 objects from which 9 are new confirmed carbon stars and 63 are M-type stars. For seven Mirids with known pulsation periods the absolute luminosities are derived, using Period-Luminosity relations. Absolute visual magnitudes and distances for five M dwarfs are estimated, using V-I color index. The object FBS 0845+466 is a candidate carbon dwarf with distance r~72pc.
67. FBS 13th list of late M and carbon stars
ID:
ivo://CDS.VizieR/J/other/Ap/45.322
Title:
FBS 13th list of late M and carbon stars
Short Name:
J/other/Ap/45.32
Date:
21 Oct 2021
Publisher:
CDS
Description:
The thirteenth list of faint late M and carbon type stars detected on the plates of the First Byurakan Spectral Sky Survey in zone +1{deg}<={delta}<=+13{deg} covering about 3118 sq. degrees is presented. From 285 stars, 161 are newly detected objects: they are 17 carbon stars, 25 carbon star candidates, and 117 M-type stars. The spectral type of two objects is assumed to be between M8 - M9 or late N-subtypes. Among 161 objects, 85 (66 PSC + 19 FSC) are unclassified IRAS sources. Accurate positions, spectral classes, red magnitudes, and color indices are given using several astronomical databases. Finding charts from DSS are given for the most interesting objects.
68. FBS 14th list of late M and carbon stars
ID:
ivo://CDS.VizieR/J/other/Ap/46.475
Title:
FBS 14th list of late M and carbon stars
Short Name:
J/other/Ap/46.47
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the fourteenth list of faint late M and carbon type stars detected on the plates of the First Byurakan Spectral Sky Survey in the zone +13{deg}<=DE<=+33{deg} covering about 4736deg^2^. From 260 stars, 118 are newly detected objects: they are 19 carbon stars, 5 carbon star candidates, and 94 M-type stars. Among 118 detected objects 73 (57 PSC + 16 FSC) are unclassified IRAS sources. Accurate positions, spectral classes, red magnitudes, color indices, and near-infrared J, H and K photometry are given, using several astronomical databases. Finding charts from DSS are given for the most interesting objects.
69. Galactic carbon stars infrared spectroscopy
ID:
ivo://CDS.VizieR/J/ApJ/887/82
Title:
Galactic carbon stars infrared spectroscopy
Short Name:
J/ApJ/887/82
Date:
21 Oct 2021
Publisher:
CDS
Description:
New infrared spectra of 33 Galactic carbon stars from FORCAST on SOFIA reveal strong connections between stellar pulsations and the dust and molecular chemistry in their circumstellar shells. A sharp boundary in overall dust content, which predominantly measures the amount of amorphous carbon, separates the semiregular and Mira variables, with the semiregulars showing little dust in their spectra and the Miras showing more. In semiregulars, the contribution from SiC dust increases rapidly as the overall dust content grows, but in Miras, the SiC dust feature grows weaker as more dust is added. A similar dichotomy is found with the absorption band from CS at ~7.3{mu}m, which is generally limited to semiregular variables. Observationally, these differences make it straightforward to distinguish semiregular and Mira variables spectroscopically without the need for long-term photometric observations or knowledge of their distances. The rapid onset of strong SiC emission in Galactic carbon stars in semiregular variables points to a different dust-condensation process before strong pulsations take over. The break in the production of amorphous carbon between semiregulars and Miras seen in the Galactic sample is also evident in Magellanic carbon stars, linking strong pulsations in carbon stars to the strong mass-loss rates which will end their lives as stars across a wide range of metallicities.
70. Galactic mass-losing AGB stars
ID:
ivo://CDS.VizieR/J/A+A/376/997
Title:
Galactic mass-losing AGB stars
Short Name:
J/A+A/376/997
Date:
21 Oct 2021
Publisher:
CDS
Description:
AGB mass-losing sources are easy to identify and to characterize in the near-infrared range (1-5{mu}m). We make use of the near-infrared data acquired by the Japanese space experiment IRTS to study a sample of sources detected in the 2 celestial strips surveyed by the IRTS. Mass-loss rates and distances are estimated for 40 carbon-rich sources and 86 oxygen-rich sources of which 8 are probably of S-type. Although the sample is small, one sees a dependence of the relative contribution of the two kinds of sources to the replenishment of the interstellar medium (ISM) on the galactocentric distance. E.g. from 6 to 8kpc, oxygen-rich sources in our sample contribute 10-12 times as much as carbon rich sources, whereas from 10 to 12kpc, the latters contribute 3-4 times as much as the formers. Therefore, one would expect a gradient in the composition of the ISM between 6 and 12kpc from the Galactic Centre, especially in its dust component. Most of the replenishment (>50%) by AGB stars is due to sources with mass-loss rate larger than 10^-6^M_{sun}_/yr.

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