2009ApJ...698L..56H

Query : 2009ApJ...698L..56H

2009ApJ...698L..56H - Astrophys. J., 698, L56-L59 (2009/June-2)

Asteroseismology of hybrid pulsators made possible: simultaneous MOST space photometry and ground-based spectroscopy of γ Peg.

HANDLER G., MATTHEWS J.M., EATON J.A., DASZYNSKA-DASZKIEWICZ J., KUSCHNIG R., LEHMANN H., RODRIGUEZ E., PAMYATNYKH A.A., ZDRAVKOV T., LENZ P., COSTA V., DIAZ-FRAILE D., SOTA A., KWIATKOWSKI T., SCHWARZENBERG-CZERNY A., BORCZYK W., DIMITROV W., FAGAS M., KAMINSKI K., ROZEK A., VAN WYK F., POLLARD K.R., KILMARTIN P.M., WEISS W.W., GUENTHER D.B., MOFFAT A.F.J., RUCINSKI S.M., SASSELOV D.D. and WALKER G.A.H.

Abstract (from CDS):

We have acquired simultaneous high-precision space photometry and radial velocities of the bright hybrid β Cep/Slowly Pulsating B pulsator γ Peg. Frequency analyses reveal the presence of six gravity (g) modes of high radial order together with eight low-order β Cep oscillations in both data sets. Mode identification shows that all pulsations have spherical degrees ℓ = 0-2. An 8.5 M☉ model reproduces the observed pulsation frequencies; all theoretically predicted modes in the β Cep domain are detected. We suggest, contrary to previous authors, that γ Peg is a single star; the claimed orbital variations are due to g-mode pulsation. γ Peg is the first hybrid pulsator for which a sufficiently large number of high-order g modes and low-order pressure (p) and mixed modes have been detected and identified to be usable for in-depth seismic modeling.

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Journal keyword(s): binaries: spectroscopic - stars: early-type - stars: individual: γ Peg - stars: oscillations - stars: variables: other

Simbad objects: 2

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Number of rows : 2
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 * gam Peg bC* 00 13 14.1523490172 +15 11 00.954346538 1.75 2.61 2.84 2.94 3.13 B2IV 693 0
2 * nu. Eri bC* 04 36 19.1419185396 -03 21 08.857744927 2.82 3.737 3.928     B2III 390 0

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