2001A&A...368..994A

Query : 2001A&A...368..994A

2001A&A...368..994A - Astronomy and Astrophysics, volume 368994-1005 (2001/3-4)

Physical parameters of sdB stars from spectral energy distributions.

AZNAR CUADRADO R. and JEFFERY C.S.

Abstract (from CDS):

The atmospheric parameters of 34 hot subdwarf B stars have been obtained using a combination of 61 short and long-wave IUE spectra, together with new and existing optical and infrared photometric data. Using a grid of high-gravity helium-deficient model atmospheres and a χ2-minimization procedure, 15 single sdB stars and 19 composite systems, containing a hot subdwarf B star and a cool main-sequence companion, were analyzed. From the (logL-logTeff) diagram of our results, we conclude that the majority of the cool companions to our sample of binary sdB stars are main sequence stars, in the range of 4000<Teff/K<6000 and mass 0.8<M/M☉<1.3. The lower limit on detectability of cool stars in composite sdB of our sample is ∼3600K, corresponding to a spectral type of M1 or later (Lang, 1992, Astrophysical data: Stars and planets (Springer-Verlag, New York)).

Abstract Copyright: ∼

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

Simbad objects: 34

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Number of rows : 34
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PG 0004+133 HS* 00 07 33.7731772800 +13 35 57.590895264   12.63 13.02     sdB2.5VHe7 36 0
2 PG 0105+276 HS* 01 08 16.5889858464 +27 52 51.564639936   14.41 14.44 14.98   sdOHe 15 0
3 PG 0110+262 HS* 01 13 14.8740411528 +26 27 31.247071416   13.000 12.875 12.913   sdB+G0V 26 0
4 PG 0229+064 HS* 02 32 36.3241519488 +06 38 52.138153824   11.97 12.29 12.37   sdB3VHe13 30 0
5 PG 0232+095 HS* 02 35 11.9876024544 +09 45 37.661292252   12.80 11.75     sdB+G1V 20 0
6 PG 0240+046 HS* 02 43 22.7759776704 +04 50 36.322903536           sdBC0.2VIIHe24 32 0
7 PG 0314+146 HS* 03 17 38.0276533488 +14 46 24.050297568   12.42 12.73 12.96   sdOC7VIIHe40 20 0
8 PG 0342+026 HS* 03 45 34.5760235952 +02 47 52.714095360   10.844 10.926 11.186   sdB3VIIHe4 51 0
9 PG 0749+658 HS* 07 54 24.4160371008 +65 42 07.368520572   12.07 12.06 12.29   sdB 34 0
10 PG 0839+399 HS* 08 43 12.7070709648 +39 44 49.808413428 12.918 14.045 14.324 14.445 14.587 sdB 40 0
11 V* HK Cnc HS* 08 59 02.6445309720 +11 56 27.841260300   13.47 13.480     sdB3VIIHe0 40 0
12 V* BI Lyn CV* 09 03 19.4276053560 +39 51 00.493503552   13.10 12.848     DB 25 0
13 PG 0934+186 HS* 09 37 16.2701312016 +18 25 11.246800692   12.85 13.13 13.44   sdB 30 0
14 Ton 1281 HS* 10 43 39.3538600656 +23 09 06.269551416   13.05 13.371     sdB+G1V 21 0
15 V* UY Sex HS* 10 50 02.8265487864 -00 00 36.879009588 12.063 13.184 13.474 13.606 13.769 sdO9VIIHe6 175 0
16 PG 1049+013 HS* 10 52 28.1944890168 +01 03 45.811607940   14.33 14.41 15.12   sdO8VIepHe1 14 0
17 PG 1104+243 HS* 11 07 26.2324234560 +24 03 11.108174724   11.49 11.39     sdOB+G2V 36 0
18 PG 1230+052 HS* 12 33 12.5632632624 +04 57 37.603907964   13.26       sdB 29 0
19 Feige 65 HS* 12 35 51.1437498960 +42 22 39.720230508   11.78 12.046     sdB2 72 1
20 V* NY Vir HS* 13 38 48.1466908176 -02 01 49.207286748   13.43 13.66 13.75   sdB1VIIHe1 237 1
21 PG 1432+004 HS* 14 35 19.8406916232 +00 13 51.115007964   12.20 12.39     sdB2VIIHe6 32 0
22 Ton 209 HS* 14 35 20.2387953384 +23 45 30.479195592   12.20 12.11 12.86   sdB2VIIHe4 29 0
23 PG 1449+653 HS* 14 50 36.0746294472 +65 05 52.012309416   13.57 13.62 13.72   sdB+G5 30 0
24 PG 1452+198 HS* 14 54 39.8152055328 +19 37 00.855649740   12.30 12.94     sdB0.5VIIIHe7 26 0
25 PG 1629+081 HS* 16 32 01.3561336032 +07 59 40.037913528   12.611 12.762 13.122   sdBO 23 0
26 PG 1701+359 HS* 17 03 21.4582783560 +35 48 49.223998800   13.41       sdB1VIHe0 36 0
27 PG 1718+519 HS* 17 19 45.3514315416 +51 52 10.717011948   13.86 13.75 13.81   sdB+G4V 20 0
28 BD+29 3070 HS* 17 38 21.2004399672 +29 08 47.348080656   10.55 10.45     sdOB+F/G 35 0
29 PG 2110+127 HS* 21 13 21.0605578368 +12 57 09.221687280   13.12 12.96 12.98   sdB 23 0
30 PG 2135+045 HS* 21 38 00.8257077936 +04 42 11.741770692   14.57 14.48 14.85   sdB 17 0
31 PG 2148+095 HS* 21 51 16.8856102680 +09 46 59.453038236   13.04 13.04 13.25   sdB0.5VHe2 20 0
32 PG 2214+184 HS? 22 17 04.5900820848 +18 37 53.518705176   14.11 14.27 14.38   sd 17 0
33 PG 2226+094 HS* 22 28 58.4823334800 +09 37 22.473322644   14.18 14.16 14.08   sdB 16 0
34 PG 2259+134 HS* 23 01 45.8247267744 +13 38 37.481529120   14.47 14.65 14.87   sdB1VIIHe9 31 0

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