New Oe Stars in LAMOST DR5

Stars of spectral type Oe are very rare. To date, only 13 Oe stars have been identified within our Galaxy. In this paper, we present six new Oe stars and four new B0e stars found in LAMOST DR5. Repeated spectral observations of the same Oe stars show some emission-line variability. The Hβ emission o...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 863; no. 1; pp. 70 - 79
Main Authors Li, Guang-Wei, Shi, Jian-Rong, Yanny, Brian, Bai, Zhong-Rui, Yu, Si-Cheng, Dong, Yi-qiao, Lei, Ya-Juan, Yuan, Hai-Long, Zhang, Wei, Zhao, Yong-Heng
Format Journal Article
LanguageEnglish
Published Philadelphia The American Astronomical Society 10.08.2018
IOP Publishing
Institute of Physics (IOP)
Subjects
ASTRONOMY AND ASTROPHYSICS
Astrophysics
Emission
Emission lines
Galaxies
H alpha line
Milky Way
Spectra
Stars
stars: early-type
stars: emission-line, Be
stars: massive
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Summary:Stars of spectral type Oe are very rare. To date, only 13 Oe stars have been identified within our Galaxy. In this paper, we present six new Oe stars and four new B0e stars found in LAMOST DR5. Repeated spectral observations of the same Oe stars show some emission-line variability. The Hβ emission of TYC 4801-17-1 shows rapid V/R variation. Phase lags in the V/R ratio of TYC 4801-17-1 spectra are also seen. We found that the unusual O4.5 star RL 128 is an Oe star with variable H intensity and its Ca ii triplet emission appears when H emission reaches maximum intensity. These newly identified early-type Oe and B0e stars significantly increase the known sample.
Bibliography:Stars and Stellar Physics
AAS10378
AC02-07CH11359
arXiv:1807.00574; FERMILAB-PUB-18-434-CD
USDOE Office of Science (SC), High Energy Physics (HEP)
ISSN:0004-637X
1538-4357
1538-4357
DOI:10.3847/1538-4357/aad04f