2002A&A...385..131A

Query : 2002A&A...385..131A

2002A&A...385..131A - Astronomy and Astrophysics, volume 385, 131-142 (2002/4-1)

Physical parameters for subdwarf B stars with composite spectra.

AZNAR CUADRADO R. and JEFFERY C.S.

Abstract (from CDS):

New intermediate-resolution spectra have been obtained for a number of subdwarf B stars having both single and composite spectra. Physical parameters have been determined for the sdB stars and, in composite-spectrum systems, their cool companions. For these binaries, we have developed a method which uses the blue-optical spectrum to determine the effective temperatures of both stars, the surface gravity of the hot stars and the radius ratio of the system. The surface gravity of the cool star is measured using the infrared calcium triplet. The surface gravities of these cool companions identify them as main-sequence stars with masses in the range 0.8-1.2M_☉, confirming a previous energy distribution analysis. There is also evidence that the composite-spectrum sdBs are more helium-poor than single-spectrum sdBs.

Abstract Copyright: ∼

Journal keyword(s): stars: formation - stars: early-type - stars: subdwarfs - stars: fundamental parameters - stars: binaries: spectroscopic

Simbad objects: 16

Full paper

View the references in ADS

Number of rows : 16

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2024	#notes
1	PG 0004+133	HS*	00 07 33.7731772800	+13 35 57.590895264		12.63	13.02			sdB2.5VHe7	31	0
2	PG 0110+262	HS*	01 13 14.8740411528	+26 27 31.247071416		13.000	12.875	12.913		sdB+G0V	21	0
3	PG 0229+064	HS*	02 32 36.3241519488	+06 38 52.138153824		11.97	12.29	12.37		sdB3VHe13	29	0
4	PG 0240+046	HS*	02 43 22.7759776704	+04 50 36.322903536						sdBC0.2VIIHe24	26	0
5	PG 0342+026	HS*	03 45 34.5760235952	+02 47 52.714095360		10.86	11.12	11.20		sdB3VIIHe4	45	0
6	PG 0749+658	HS*	07 54 24.4160371008	+65 42 07.368520572		12.07	12.06	12.29		sdB	30	0
7	PG 0839+399	HS*	08 43 12.7070709648	+39 44 49.808413428	12.918	14.045	14.324	14.445	14.587	sdB	38	0
8	PG 1104+243	HS*	11 07 26.2324234560	+24 03 11.108174724		11.49	11.39			sdOB+G2V	33	0
9	Feige 65	HS*	12 35 51.1437498960	+42 22 39.720230508		11.78	12.046			sdB2	70	1
10	V* V652 Her	pA*	16 48 04.6934854032	+13 15 42.420402252		10.31	10.51			~	136	0
11	PG 1701+359	HS*	17 03 21.4582783560	+35 48 49.223998800		13.41				sdB1VIHe0	33	0
12	PG 1718+519	HS*	17 19 45.3514315416	+51 52 10.717011948		13.86	13.75	13.81		sdB+G4V	20	0
13	PG 2110+127	HS*	21 13 21.0605578368	+12 57 09.221687280		13.12	12.96	12.98		sdB	22	0
14	PG 2135+045	HS*	21 38 00.8257077936	+04 42 11.741770692		14.57	14.48	14.85		sdB	16	0
15	PG 2148+095	HS*	21 51 16.8856102680	+09 46 59.453038236		13.04	13.04	13.25		sdB0.5VHe2	19	0
16	PG 2259+134	HS*	23 01 45.8247267744	+13 38 37.481529120		14.47	14.65	14.87		sdB1VIIHe9	28	0

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