APOGEE2-N NIR spectra of B-type stars Virtual Observatory Resource

Authors
  1. Ramirez-Preciado V.G.
  2. Roman-Lopes A.
  3. Roman-Zuniga C.G.
  4. Hernandez J.,Garcia-Hernandez D.A.
  5. Stassun K.
  6. Stringfellow G.S.
  7. Kim J.S.
  8. Published by
    CDS
Abstract

We present a semi-empirical spectral classification scheme for normal B-type stars using near-infrared (NIR) spectra (1.5-1.7{mu}m) from the Sloan Digital Sky Survey Apache Point Observatory Galaxy Evolution Experiment (APOGEE2)-N data release 14 (DR14) database. The main motivation for working with B-type stars is their importance in the evolution of young stellar clusters; however, we also take advantage of having a numerous sample (316 stars) of B-type star candidates in APOGEE2-N, for which we also have optical (3600-9100{AA}) counterparts from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) survey. By first obtaining an accurate spectral classification of the sources using the LAMOST DR3 spectra and the canonical spectral classification scheme, we found a linear relation between optical spectral types and the equivalent widths of the hydrogen lines of the Brackett series in the APOGEE2-N NIR spectra. This relation extends smoothly from a similar relation for O and early B stars found by Roman-Lopes+ (2018, J/ApJ/855/68). This way, we obtain a catalog of B-type sources with features in both the optical and NIR and a classification scheme refined down to one spectral subclass.

Keywords
  1. b-stars
  2. infrared-astronomy
  3. spectroscopy
  4. visible-astronomy
  5. line-intensities
  6. stellar-spectral-types
Bibliographic source Bibcode
2020ApJ...894....5R
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/894/5
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/894/5
Document Object Identifer DOI
doi:10.26093/cds/vizier.18940005

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History

2021-10-18T10:08:05Z
Resource record created
2021-10-18T10:08:05Z
Created
2022-01-19T12:59:33Z
Updated

Contact

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CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
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