- ID:
- ivo://CDS.VizieR/V/116
- Title:
- Galactic O star catalog
- Short Name:
- V/116
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have produced a catalog of 378 Galactic O stars with accurate spectral classifications that is complete for V<8 but includes many fainter stars. The catalog provides cross-identifications with other sources; coordinates (obtained in most cases from Tycho-2 data); astrometric distances for 24 of the nearest stars; optical (Tycho-2, Johnson, and Stroemgren) and NIR photometry; group membership, runaway character, and multiplicity information; and a Web-based version with links to on-line services.
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12. Galactic O Stars
- ID:
- ivo://CDS.VizieR/III/84B
- Title:
- Galactic O Stars
- Short Name:
- III/84B
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The catalog is a compilation of published data for 644 galactic O stars of luminosity class V. The catalog is intended to be useful to O-type star observers by providing a reference list for general studies on O-type stars. The catalog includes cross identifications, equatorial and galactic coordinates, visual or photographic magnitudes, B-V, spectral types, distances to the stars, radial velocities, HII region identifications, remarks, and notes.
- ID:
- ivo://CDS.VizieR/III/274
- Title:
- Galactic O-Star Spectroscopic Survey (GOSSS)
- Short Name:
- III/274
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalog is the result of combining the spectral types in 2011ApJS..193...24S (Paper I) and 2014ApJS..211...10S (Paper II), the first two major papers of the Galactic O-Star Spectroscopic Survey (GOSSS). Together they constitute Data Release 1.1 of the survey and they supersede the previous 1.0 release from June 2013. Most of the spectral types for northern ({delta}>-20{deg}) stars are from Paper I and all of the spectral types for southern ({delta}<-20{deg}) stars are from Paper II. However, for some northern stars the spectral type is from Paper II.
- ID:
- ivo://CDS.VizieR/II/82
- Title:
- Galactic O-type Stars
- Short Name:
- II/82
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The catalog is a compilation from the literature of all O-type stars for which spectral types, luminosity classes, and UBV photometry exist. The catalog contains 765 stars, for each of which designation (HD, DM, etc.), spectral type, V, B-V, absolute visual magnitude, absolute bolometric magnitude, cluster membership, distance, galactic coordinates, and source references are given. In addition, the authors have included derived values of absolute visual and bolometric magnitudes, and distances. The Catalog of Galactic O-Type Stars (Garmany, Conti and Chiosi 1982) is a compilation from the literature of all O-type stars for which spectral types, luminosity classes and UBV photometry exist. Most of the entries come from Cruz-Gonzalez, et al. (1974) and Humphreys (1978), with additional stars from Garrison and Kormendy (1976), Garrison, Hiltner and Schild (1977), Garrison and Schild (1979), Feinstein, Marraco and Muzzio (1973), Feinstein, Marraco and Forte (1976), and Moffat, FitzGerald and Jackson (1979).
- ID:
- ivo://CDS.VizieR/J/ApJS/253/54
- Title:
- Galactic O-type stars from LAMOST spectra
- Short Name:
- J/ApJS/253/54
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This paper reports 209 O-type stars found with LAMOST. All 135 new O-type stars discovered so far with LAMOST are given. Among them, 94 stars are first presented in this sample. There are 1 Iafpe star, 5 Onfp stars, 12 Oe stars, 1 Ofc stars, 3 ON stars, 16 double-lined spectroscopic binaries, and 33 single-lined spectroscopic binaries. All O-type stars are determined based on LAMOST low-resolution spectra (R~1800), with their LAMOST median-resolution spectra (R~7500) as supplements.
- ID:
- ivo://CDS.VizieR/J/ApJS/224/4
- Title:
- GOSSS III. 142 additional O-type systems
- Short Name:
- J/ApJS/224/4
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This is the third installment of the Galactic O-Star Spectroscopic Survey (GOSSS), a massive spectroscopic survey of Galactic O stars, based on new homogeneous, high signal-to-noise ratio, R~2500 digital observations selected from the Galactic O-Star Catalog. In this paper, we present 142 additional stellar systems with O stars from both hemispheres, bringing the total of O-type systems published within the project to 590. Among the new objects, there are 20 new O stars. We also identify 11 new double-lined spectroscopic binaries, 6 of which are of O+O type and 5 of O+B type, and an additional new tripled-lined spectroscopic binary of O+O+B type. We also revise some of the previous GOSSS classifications, present some egregious examples of stars erroneously classified as O-type in the past, introduce the use of luminosity class IV at spectral types O4-O5.5, and adapt the classification scheme to the work of Arias et al.
- ID:
- ivo://CDS.VizieR/J/A+A/546/A77
- Title:
- H{alpha} images of HD93521
- Short Name:
- J/A+A/546/A77
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Owing to its unusual location and its isolation, the nature of the high Galactic latitude O9.5 Vp object HD 93521 is still uncertain. We have collected X-ray and optical observations to characterize the star and its surroundings.
- ID:
- ivo://CDS.VizieR/J/MNRAS/426/2208
- Title:
- H{alpha} variations of O9 subgiant HD57682
- Short Name:
- J/MNRAS/426/2208
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The O9IV star HD 57682, discovered to be magnetic within the context of the Magnetism in Massive Stars (MiMeS) survey in 2009, is one of only eight convincingly detected magnetic O-type stars. Among this select group, it stands out due to its sharp-lined photospheric spectrum. Since its discovery, the MiMeS Collaboration has continued to obtain spectroscopic and magnetic observations in order to refine our knowledge of its magnetic field strength and geometry, rotational period and spectral properties and variability. In this paper we report new Echelle SpectroPolarimetric Device for the Observation of Stars (ESPaDOnS) spectropolarimetric observations of HD 57682, which are combined with previously published ESPaDOnS data and archival H{alpha} spectroscopy. This data set is used to determine the rotational period (63.5708+/-0.0057d), refine the longitudinal magnetic field variation and magnetic geometry (dipole surface field strength of 880+/-50G and magnetic obliquity of 79+/-4{deg} as measured from the magnetic longitudinal field variations, assuming an inclination of 60{deg}) and examine the phase variation of various lines.
- ID:
- ivo://CDS.VizieR/J/A+A/615/A19
- Title:
- HD54662 radial velocities and X-ray light curves
- Short Name:
- J/A+A/615/A19
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- HD 54662 is an O-type binary star belonging to the CMa OB1 association. Due to its long-period orbit, this system is an interesting target to test the adiabatic wind shock model. The goal of this study is to improve our knowledge of the orbital and stellar parameters of HD 54662 and to analyze its X-ray emission to test the theoretical scaling of X-ray emission with orbital separation for adiabatic wind shocks. A spectral disentangling code is applied to a set of optical spectra to determine the radial velocities, as well as the individual spectra of the primary and secondary stars. The orbital solution of the system is established and the reconstructed individual spectra are analyzed by means of the CMFGEN model atmosphere code. Two X-ray spectra are fitted using a Markov Chain Monte Carlo algorithm and are compared to the emission expected from adiabatic shocks. We determine an orbital period of 2103.4 days, a surprisingly low orbital eccentricity of 0.11, and a mass ratio m_2/m_1 of 0.84. Combined with the orbital inclination inferred in a previous astrometric study, we obtain surprisingly low masses of 9.7 and 8.2M_{sun}_. From the disentangled primary and secondary spectra, we infer O6.5 spectral types for both stars with the primary being about two times brighter than the secondary. The softness of the X-ray spectra for the two observations, the very small variation of best-fitting spectral parameters and the comparison of the X-ray-to- bolometric luminosity ratio with the canonical value for O-type stars allow us to conclude that the X-ray emission from the wind interaction region is quite small and that the observed emission is rather dominated by the intrinsic emission from the stars. Computing the peculiar radial and intrinsic emission from the stars. Computing the peculiar radial and tangential velocities, we cannot confirm the runaway status previously attributed to HD 54662. We find no X-ray emission associated with the bow shock detected in the infrared. The lack of hard X-ray emission from the wind-shock region suggests that the mass-loss rates are lower than expected and/or that the pre-shock wind velocities are much lower than the terminal wind velocities. The bow shock associated with HD 54662 possibly corresponds to a wind-blown arc created by the interaction of the stellar winds with the ionized gas of the CMa OB1 association rather than by a large differential velocity between the binary and the surrounding interstellar medium.
- ID:
- ivo://CDS.VizieR/J/A+A/428/149
- Title:
- Hipparcos parallaxes of O stars
- Short Name:
- J/A+A/428/149
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We compare the absolute visual magnitude of the majority of bright O stars in the sky as predicted from their spectral type with the absolute magnitude calculated from their apparent magnitude and the Hipparcos parallax. We find that many stars appear to be much fainter than expected, up to five magnitudes. We find no evidence for a correlation between magnitude differences and the stellar rotational velocity as suggested for OB stars by Lamers et al. (1997A&A...325L..25L), whose small sample of stars is partly included in ours.
