2001ApJ...556L..55S


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET07:04:31

2001ApJ...556L..55S - Astrophys. J., 556, L55-L58 (2001/July-3)

The stellar parameters and evolutionary state of the primary in the d' symbiotic system StHα 190.

SMITH V.V., PEREIRA C.B. and CUNHA K.

Abstract (from CDS):

We report on a high-resolution spectroscopic stellar parameter and abundance analysis of a d' symbiotic star: the yellow component of StHα190. This star has recently been discovered, and confirmed here, to be a rapidly rotating (vsini=100±10 km.s–1) subgiant, or giant, that exhibits radial velocity variations of probably at least 40 km.s–1, indicating the presence of a companion (as in many symbiotic systems, the companion is a hot white dwarf star). An analysis of the red spectrum reveals the cool stellar component to have an effective temperature of Teff=5300±150 K and a surface gravity of logg=3.0±0.5 (this corresponds to an approximate spectral type of G4 III/IV). These parameters result in an estimated primary luminosity of 45 L, implying a distance of about 780 pc (within a factor of 2). The iron and calcium abundances are found to be close to solar; however, barium is overabundant, relative to Fe and Ca, by about 0.5 dex. The Ba enhancement reflects mass transfer of s-process-enriched material when the current white dwarf was an asymptotic giant branch star, of large physical dimension (≥1 AU). The past and future evolution of this binary system depends critically on its current orbital period, which is not yet known. Concerted and frequent radial velocity measurements are needed to provide crucial physical constraints to this d' symbiotic system.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: Symbiotic - Stars: Abundances - Stars: Rotation

CDS comments: p. L58 : UKS Ce1 = NAME UKS Ce-1

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 EM* StHA 32 Sy* 04 37 45.6311522513 -01 19 11.896504207     13.5     C1,1e_CH5 31 0
2 V* AG Dra Sy* 16 01 41.0125687664 +66 48 10.131181273 11.50 11.06 9.74 8.52   K3IIIep 477 0
3 NAME UKS-Ce1 Sy* 16 15 29.6279771715 -22 12 15.560438504       15.51 14.19 C4,5Je_CH4 29 0
4 V* LT Del Sy* 20 35 57.2353984617 +20 11 27.504214453           G6III 96 1
5 EM* StHA 190 Sy* 21 41 44.8880611733 +02 43 54.409367196   11.13 10.22     G5e 41 0

    Equat.    Gal    SGal    Ecl

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2020.11.25-07:04:31

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