2005A&A...432L..43B


Query : 2005A&A...432L..43B

2005A&A...432L..43B - Astronomy and Astrophysics, volume 432, L43-48 (2005/3-3)

The non-detection of oscillations in Procyon by MOST: Is it really a surprise?

BEDDING T.R., KJELDSEN H., BOUCHY F., BRUNTT H., BUTLER R.P., BUZASI D.L., CHRISTENSEN-DALSGAARD J., FRANDSEN S., LEBRUN J.-C., MARTIC M. and SCHOU J.

Abstract (from CDS):

We argue that the non-detection of oscillations in Procyon by the MOST satellite reported by Matthews et al. (2004Natur.430...51M) is fully consistent with published ground-based velocity observations of this star. We also examine the claims that the MOST observations represent the best photometric precision so far reported in the literature by about an order of magnitude and are the most sensitive data set for asteroseismology available for any star other than the Sun. These statements are not correct, with the most notable exceptions being observations of oscillations in α Cen A that are far superior. We further disagree that the hump of excess power seen repeatedly from velocity observations of Procyon can be explained as an artefact caused by gaps in the data. The MOST observations failed to reveal oscillations clearly because their noise level is too high, possibly from scattered Earthlight in the instrument. We did find an excess of strong peaks in the MOST amplitude spectrum that is inconsistent with a simple noise source such as granulation, and may perhaps indicate oscillations at roughly the expected level.

Abstract Copyright:

Journal keyword(s): stars: oscillations - stars: individual: Procyon - Sun: oscillations

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * eta Cas PM* 00 49 06.2945942922 +57 48 54.638239716 4.04 4.02 3.44 2.94 2.58 F9V 619 0
2 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1825 0
3 NGC 2682 127 V* 08 51 20.1237509496 +11 46 41.751494436 13.336 13.32 12.776   12.08 ~ 77 0
4 NGC 2682 OpC 08 51 23 +11 48.8           ~ 2191 0
5 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 966 1
6 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1208 0

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2022.08.11-02:10:54

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