2009AJ....137..118P


Query : 2009AJ....137..118P

2009AJ....137..118P - Astron. J., 137, 118-128 (2009/January-0)

High-resolution spectroscopic observations of four yellow-type symbiotic stars: CD-43°14304, Hen 3-1213, Hen 3-863, and StHα 176.

PEREIRA C.B. and ROIG F.

Abstract (from CDS):

We report on the analysis of high-resolution optical spectra of four symbiotic stars CD-43°14304, Hen 3-863, Hen 3-1213, and StHα176. The chemical composition of the atmospheres of the investigated stars shows that they are all metal-poor K giants with metallicities around [Fe/H] ~ -1.0. All stars show an enrichment of the elements created by slow neutron-capture reactions. The luminosities obtained for the symbiotic star CD-43°14304 and probably for Hen 3-1213 are below those of the asymptotic giant branch (AGB) stars that started helium-burning (via thermal pulses) and became self-enriched in the neutron-capture elements. Therefore, their abundance peculiarities are due to mass transfer from the previous thermally pulsing AGB star (now the white dwarf), overabundant in s-process elements. For the stars Hen 3-863 and StHα176, the uncertainties due to the distance (and interstellar absorption as well) prevent a reliable determination of the luminosity. The heavy-element abundance distribution of these four analyzed symbiotics is similar to that of the three symbiotics previously analyzed (AG Dra, BD-21°3873, and Hen 2-467). Finally, their general abundance pattern follows the halo standard abundance.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: chemically peculiar - stars: evolution - stars: individual (CD-43 14304, Hen 3-863, Hen 3-1213, StHa 176)

CDS comments: In paragraph 4.1.1 CD-43 1430 is a misprint for CD-43 14304.

Simbad objects: 10

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Number of rows : 10
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 BD+75 348 C* 08 46 11.6352830712 +74 32 31.232954292   10.63 9.54     C3,0_Ba4 41 0
2 Hen 3-863 Sy* 13 07 43.8887117496 -48 00 19.547431776     12.60     ~ 23 0
3 BD-21 3873 Sy* 14 16 34.2914973552 -21 45 50.036218344   12.060 10.684     K2e 75 0
4 V* AG Dra Sy* 16 01 41.0120557968 +66 48 10.135056672 11.50 11.06 9.74 8.52   K3IIIep 493 0
5 WRAY 15-1511 Sy* 16 35 15.0820930416 -51 42 27.579159756 14.14 13.92 12.78 11.47 9.80 M2e 31 0
6 ATO J305.6761-21.1318 CV* 20 22 42.2615505336 -21 07 54.674066388     12.5     ~ 14 0
7 V* LT Del Sy* 20 35 57.2354539608 +20 11 27.506897808           G6III 100 1
8 HD 196944 SB* 20 40 46.0815001992 -06 47 50.604476604   9.01 8.40 8.08   CEMP-rs 100 0
9 CD-43 14304 Sy* 21 00 06.3576663648 -42 38 44.934991116     11.0     K7e 55 0
10 BD-15 6060 LP? 21 46 09.3423868872 -15 14 39.766213896   11.1 9.45     CEMP-s 44 1

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2023.06.10-00:54:00

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