# The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-Violet at R~2500

@article{Sota2011TheGO,
title={The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-Violet at R~2500},
author={A. Sota and Jes'us Ma'iz Apell'aniz and Nolan R. Walborn and Emilio J. Alfaro and Rodolfo H. Barb'a and Nidia I. Morrell and R. C. Gamen and Julia I Arias},
journal={arXiv: Astrophysics of Galaxies},
year={2011}
}
• A. Sota, +5 authors J. Arias
• Published 20 January 2011
• Physics
• arXiv: Astrophysics of Galaxies
We present the first installment of a massive spectroscopic survey of Galactic O stars, based on new, high signal-to-noise ratio, R~2500 digital observations from both hemispheres selected from the Galactic O-Star Catalog of Ma\'iz Apell\'aniz et al. (2004) and Sota et al. (2008). The spectral classification system is rediscussed and a new atlas is presented, which supersedes previous versions. Extensive sequences of exceptional objects are given, including types Ofc, ON/OC, Onfp, Of?p, Oe, and…
189 Citations

## Figures and Tables from this paper

The Galactic O-Star Spectroscopic Survey (GOSSS). III. 142 additional O-type systems
This is the third installment of 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
Optical-NIR dust extinction towards Galactic O stars
• Physics
• 2017
[ABRIDGED] Context. O stars are excellent tracers of the intervening ISM because of their high luminosity, blue intrinsic SED, and relatively featureless spectra. We are currently conducting GOSSS,
New O-type stars in the LAMOST Data Release 3
• Physics
Monthly Notices of the Royal Astronomical Society
• 2019
In this paper, we present a sample of 27 new Galactic O-type stars found in the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release 3 (DR3). The new O-stars were
The X-ray catalog of spectroscopically identified Galactic O stars
• Physics
Astronomy & Astrophysics
• 2018
The X-ray emission of O-type stars was first discovered in the early days of the Einstein satellite. Since then many different surveys have confirmed that the ratio of X-ray to bolometric luminosity
Further results from the galactic O-Star Spectroscopic Survey: rapidly rotating late ON giants
With new data from the Galactic O-Star Spectroscopic Survey, we confirm and expand the ONn category of late-O, nitrogen-enriched (N), rapidly rotating (n) giants. In particular, we have discovered
New Luminous ON Spectra from the Galactic O-Star Spectroscopic Survey
• Physics
• 2016
Two new ON supergiant spectra (bringing the total known to seven) and one new ONn giant (total of this class now eight) are presented; they have been discovered by the Galactic O-Star Spectroscopic
MONOS: Multiplicity Of Northern O-type Spectroscopic systems
Context. Multiplicity in massive stars is key to understanding the chemical and dynamical evolution of galaxies. Among massive stars, those of O type play a crucial role due to their high masses and
A Spectroscopic Survey of Massive Stars in M31 and M33
• Physics
• 2016
We describe our spectroscopic follow-up to the Local Group Galaxy Survey (LGGS) photometry of M31 and M33. We have obtained new spectroscopy of 1895 stars, allowing us to classify 1496 of them for
Far-infrared emission of massive stars
• Physics
Astronomy & Astrophysics
• 2018
We present results of the analysis of a sample of 22 stars of spectral types from O7 to B5 and luminosity classes I–V for which spectra from the Infrared Spectrograph (IRS) of Spitzer are available.
Spectral Classification of B Stars: The Empirical Sequence Using SDSS-IV/APOGEE Near-IR Data
We present a semi-empirical spectral classification scheme for normal B-type stars using near-infrared spectra (1.5-1.7 $\mu$m) from the SDSS APOGEE2-N DR14 database. The main motivation for working

## References

SHOWING 1-10 OF 83 REFERENCES
A New Spectral Classification System for the Earliest O Stars: Definition of Type O2
High-quality, blue-violet spectroscopic data are collected for 24 stars that have been classified as type O3 and that display the hallmark N IV and N V lines. A new member of the class is presented;
The High Angular Resolution Multiplicity of Massive Stars
• Physics
• 2009
Abstract : We present the results of a speckle interferometric survey of Galactic massive stars that complements and expands upon a similar survey made over a decade ago. The speckle observations
Early Results from the Galactic O-Star Spectroscopic Survey: C III Emission Lines in Of Spectra
On the basis of an extensive new spectroscopic survey of Galactic O stars, we introduce the Ofc category, which consists of normal spectra with C III {lambda}{lambda}4647-4650-4652 emission lines of
On the class of Oe stars
• Physics
• 2004
We present high-quality spectra of the majority of stars that have been classified as Oe and find that their published spectral types are generally too early, most likely due to infilling of He I
ADAPTIVE OPTICS PHOTOMETRY AND ASTROMETRY OF BINARY STARS. III. A FAINT COMPANION SEARCH OF O-STAR SYSTEMS*
• Physics
• 2008
Abstract : We present the results of an adaptive optics survey for faint companions among Galactic O-type star systems (with V 8) using the Advanced Electro-Optical System (AEOS) 3.6 m telescope on
The space distribution of the O stars in the solar neighborhood.
New results pertaining to the two-dimensional spectral classification system for the O stars are presented. Classifications for additional stars in both hemispheres are given, and two groups of
Contemporary optical spectral classification of the OB stars - A digital atlas
• Physics
• 1990
Some recent developments in the optical classification of OB spectra are reviewed in terms of a comprehensive atlas of new blue-violet digital data from the CTIO 1-meter photon-counting system. These
The Ultraviolet and Optical Spectra of Metal‐deficient O Stars in the Small Magellanic Cloud1
ABSTRACT An ultraviolet and optical spectral atlas of 15 O stars in the Small Magellanic Cloud (SMC) is presented and described. The echelle data have resolving powers of order 104; they were
A Galactic O Star Catalog
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
ICCD Speckle Observations of Binary Stars. XIX. An Astrometric/Spectroscopic Survey of O Stars
• Physics
• 1998
We present the results of a speckle interferometric survey made with the CHARA speckle camera and 4 m–class telescopes of Galactic O-type stars with V 59% have a visual or spectroscopic companion)