2009A&A...508.1417P


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.21CEST07:53:29

2009A&A...508.1417P - Astronomy and Astrophysics, volume 508, 1417-1421 (2009/12-4)

51 Pegasi - a planet-bearing Maunder minimum candidate.

POPPENHAEGER K., ROBRADE J., SCHMITT J.H.M.M. and HALL J.C.

Abstract (from CDS):

We observed 51 Peg, the first detected planet-bearing star, in a 55ks XMM-Newton pointing and in 5ks pointings each with Chandra HRC-I and ACIS-S. The star has a very low count rate in the XMM observation, but is clearly visible in the Chandra images due to the detectors' different sensitivity at low X-ray energies. This allows a temperature estimate for 51 Peg's corona of T≲1MK; the detected ACIS-S photons can be plausibly explained by emission lines of a very cool plasma near 200eV. The constantly low X-ray surface flux and the flat-activity profile seen in optical CaII data suggest that 51 Peg is a Maunder minimum star; an activity enhancement due to a Hot Jupiter, as proposed by recent studies, seems to be absent. The star's X-ray fluxes in different instruments are consistent with the exception of the HRC Imager, which might have a larger effective area below 200 eV than given in the calibration.

Abstract Copyright:

Journal keyword(s): stars: coronae - stars: activity - stars: individual: 51 Peg - X-rays: stars - X-rays: individual: 51 Peg

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * alf Cen ** 14 39 29.71993 -60 49 55.9990   0.4 -0.1     G2V+K1V 850 0
2 * 51 Peg b Pl 22 57 27.9804167474 +20 46 07.782240714           ~ 553 1
3 * 51 Peg Ro* 22 57 27.9804167474 +20 46 07.782240714 6.39 6.16 5.46 4.97 4.61 G2IV 1093 1

    Equat.    Gal    SGal    Ecl

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