Spectroscopy of Known and Suspect Be Stars in Open Clusters
Abstract
In the course of our study of Hα emission variability in massive (primarily Be) stars in young open clusters using serial narrowband photometry (Souza, Davis and Teich 2013,BAAS.45, PM354.22; Souza, Beltz-Mohrmann and Sami 2014. JAAVSO, 42, 154) a number of stars of interest emerged. Some we suspected to be Be stars based on narrowband colors, or based on broadband colors plus apparent irregular variability; others exhibited possible emission or irregular variability, but lacked complete or recent spectral classification. We therefore obtained medium-resolution blue and red spectra of ~20 of these stars using the DIS spectrograph on the ARC 3.5-meter telescope at Apache Point Observatory, and used Gray (Gray, R.O. 2009, "A Digital Spectral Classification Atlas," V1.07) as a classification reference. In this manner we previously classified BD+35 1111 as B2Ve, the only confirmed Be star in the field of M38 (Souza, Kwitter, Sami and Beltz-Mohrmann 2013,BAAS.46, PM291.05). In the present work we classify 6 new Be stars previously lacking either known hydrogen emission, B or OB classification, or both. We also provide new or refined spectral classifications for 4 known Be stars and 6 non-Be early-type stars. We gratefully acknowledge support from Williams College.This work is based on observations obtained with Apache Point Observatory's 3.5-m Astrophysical Research Consortium Telescope.
- Publication:
-
American Astronomical Society Meeting Abstracts #233
- Pub Date:
- January 2019
- Bibcode:
- 2019AAS...23324904S