Radial velocity distribution and line strengths of 33 carbon stars in the Galactic bulge
1991; IOP Publishing; Volume: 367; Linguagem: Inglês
10.1086/169651
ISSN1538-4357
AutoresNeil deGrasse Tyson, R. Michael Rich,
Tópico(s)Astronomical Observations and Instrumentation
Resumoview Abstract Citations (39) References (56) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Radial Velocity Distribution and Line Strengths of 33 Carbon Stars in the Galactic Bulge Tyson, Neil D. ; Rich, R. Michael Abstract This paper presents optical spectra of 33 carbon stars discovered by Azzopardi et al. (1985) in low-extinction windows to the Galactic bulge. From these spectra, the radial velocity distribution for the stars was obtained; the dispersion was found to be 113 + or - 14 km/sec (consistent with that of the bulge K and M giants) and the mean to be -44 + or - 20 km/sec. From the velocity distribution, it was found that the carbon stars do not share the kinematics of the local neighborhood and are likely to be genuine bulge members, making it possible to assign distances and accurate luminosities. Nineteen of the stars showed enhanced C-13, classifying them as J-star candidates. Two stars showed weak C2 absorption, classifying them as CS stars, and thirteen carbon stars appeared to be hydrogen-deficient. Publication: The Astrophysical Journal Pub Date: February 1991 DOI: 10.1086/169651 Bibcode: 1991ApJ...367..547T Keywords: Astronomical Spectroscopy; Carbon Stars; Galactic Bulge; Line Spectra; M Stars; Radial Velocity; Velocity Distribution; Giant Stars; K Stars; Metallicity; Star Formation; Stellar Spectra; Astrophysics; GALAXIES: THE GALAXY; RADIAL VELOCITIES; STARS: CARBON full text sources ADS | data products SIMBAD (5)
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