2006A&A...446..603S


Query : 2006A&A...446..603S

2006A&A...446..603S - Astronomy and Astrophysics, volume 446, 603-609 (2006/2-1)

An abundance analysis of the symbiotic star CH Cygni.

SCHMIDT M.R., ZACS L., MIKOLAJEWSKA J. and HINKLE K.H.

Abstract (from CDS):

The photospheric abundances for the cool component of the symbiotic star were calculated for the first time using high-resolution near-infrared spectra and the method of of standard LTE analysis and atmospheric models. The iron abundance for CH Cyg was found to be solar, [Fe/H]=0.0±0.19. The atmospheric parameters (Teff=3100K, logg=0.0 (cgs), ξt=2.2km/s) and metallicity for CH Cyg are found to be approximately equal to those for nearby field M7 giants. The calculated [C/H]=-0.15, [N/H]=+0.16, [O/H]=-0.07, and the isotopic ratios of 12C/13C and 16O/17O are close to the mean values for single M giants that have experienced the first dredge-up. A reasonable explanation for the absence of barium star-like chemical peculiarities seems to be the high metallicity of CH Cyg. The emission line technique was explored for estimating CNO ratios in the wind of the giant.

Abstract Copyright:

Journal keyword(s): binaries: symbiotic - stars: abundances - stars: late-type - stars: individual: CH Cyg

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* V1261 Ori Sy* 05 22 18.6449207496 -08 39 58.031922816 10.28 8.57 6.77     S4,1 144 0
2 * alf Ori s*r 05 55 10.30536 +07 24 25.4304 4.38 2.27 0.42 -1.17 -2.45 M1-M2Ia-Iab 1593 0
3 * lam Dra V* 11 31 24.2207524 +69 19 51.869616 7.44 5.47 3.85 2.54 1.55 M0III-IIIaCa1 128 0
4 V* RX Boo AB* 14 24 11.6253191184 +25 42 13.394221596   9.23 8.60     M7.5-M8 432 0
5 * alf Her ** 17 14 38.85818 +14 23 25.2262   4.51 3.06     M5Ib-II+G5III+F2V: 195 0
6 V* CH Cyg Sy* 19 24 33.0657463320 +50 14 29.095038672 8.14 8.77 7.08   5.345 M7IIIab+Be 757 0

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2023.02.02-18:26:47

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