2010AJ....139.2639L

Query : 2010AJ....139.2639L

2010AJ....139.2639L - Astron. J., 139, 2639-2642 (2010/June-0)

A period investigation of the SX Phoenicis star DY Pegasi.

LI L.-J. and QIAN S.-B.

Abstract (from CDS):

We measure two new times of light maximum of the SX Phoenicis star DY Pegasi in 2008 December and collect 410 pe/CCD times of light maximum that had been published. These data could be modeled with a nonlinear fit including a continuously decreasing period change (dP/dt = -9.04x10–12 days/day) and a periodic change with a period of 42.2 yr. If this periodic change is caused by the light traveling time effect of an orbital motion of DY Pegasi in a binary system, the deduced mass of the companion could be 0.028 M☉ and it is probably a brown dwarf.

Abstract Copyright: ∼

Journal keyword(s): stars: individual: DY Pegasi - stars: variables: delta Scuti - techniques: photometric

VizieR on-line data: <Available at CDS (J/AJ/139/2639): table1.dat refs.dat>

Simbad objects: 7

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Number of rows : 7
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 GD 428 SX* 03 47 19.8773016336 +63 22 42.150015336   13.10   13.26   ~ 104 0
2 V* KZ Hya SX* 10 50 54.0711823776 -25 21 14.729108688   10.19 10.06     B9III/IV 86 0
3 * del Sct dS* 18 42 16.4268984096 -09 03 09.188922060   5.04 4.71     F2II-III 507 0
4 V* CY Aqr SX* 22 37 47.8520659536 +01 32 03.805667412 10.75 10.61 10.44     B8 218 0
5 2MASS J23084055+1708144 AB? 23 08 40.5484627296 +17 08 14.413579620     11.1     M3e 5 0
6 V* DY Peg SX* 23 08 51.1858042512 +17 12 55.997525808   10.56 10.26     F5 204 1
7 HD 218587 * 23 09 05.0511876240 +17 08 20.764755456   10.42 9.91     G0 15 0

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