2004MNRAS.348.1164R

Query : 2004MNRAS.348.1164R

2004MNRAS.348.1164R - Mon. Not. R. Astron. Soc., 348, 1164-1174 (2004/March-2)

Observations of the pulsating subdwarf B star Feige 48: Constraints on evolution and companions.

REED M.D., KAWALER S.D., ZOLA S., JIANG X.J., DREIZLER S., SCHUH S.L., DEETJEN J.L., KALYTIS R., MEISTAS E., JANULIS R., ALISAUSKAS D., KRZESINSKI J., VUCKOVIC M., MOSKALIK P., OGLOZA W., BARAN A., STACHOWSKI G., KURTZ D.W., GONZALEZ PEREZ J.M., MUKADAM A., WATSON T.K., KOEN C., BRADLEY P.A., CUNHA M.S., KILIC M., KLUMPE E.W., CARLTON R.F., HANDLER G., KILKENNY D., RIDDLE R., DOLEZ N., VAUCLAIR G., CHEVRETON M., WOOD M.A., GRAUER A., BROMAGE G., SOLHEIM J.E., OSTENSEN R., ULLA A., BURLEIGH M., GOOD S., HURKAL O., ANDERSON R. and PAKSTIENE E.

Abstract (from CDS):

Since pulsating subdwarf B (sdBV or EC14026) stars were first discovered, observational efforts have tried to realize their potential for constraining the interior physics of extreme horizontal branch stars. Difficulties encountered along the way include uncertain mode identifications and a lack of stable pulsation mode properties. Here we report on Feige 48, an sdBV star for which follow-up observations have been obtained spanning more than four years. These observations show some stable pulsation modes.

We resolve the temporal spectrum into five stable pulsation periods in the range 340-380 s with amplitudes less than 1 per cent, and two additional periods that appear in one data set each. The three largest amplitude periodicities are nearly equally spaced, and we explore the consequences of identifying them as a rotationally split ℓ= 1 triplet by consulting a representative stellar model.

The general stability of the pulsation amplitudes and phases allows us to use the pulsation phases to constrain the time-scale of evolution for this sdBV star. Additionally, we are able to place interesting limits on any stellar or planetary companion to Feige 48.


Abstract Copyright: 2004 RAS

Journal keyword(s): stars: individual (Feige 48) - stars: oscillations - stars: variables: other

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 - 2026 		#notes
1 Feige 48 HS* 11 47 14.4978515760 +61 15 31.789400364   13.12 13.28     sdB 125 0
2 PG 1605+072 HS* 16 08 03.6872637792 +07 04 28.748468964   12.53 12.83 13.18   sdB0.2VIHe3 136 0
3 GD 358 WD* 16 47 18.3925183824 +32 28 32.862804384 12.511 13.530 13.653 13.752 13.852 DB2 364 0
4 KPD 2109+4401 HS* 21 11 47.6445824136 +44 13 50.620755936 12.14 13.11 13.30 13.64   sdB 72 0
5 V* IR Peg WD* 21 34 08.2124719240 +06 50 57.662044329   16.15       PG1159 122 0

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