SIMBAD references

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

51 Pegasi - a planet-bearing Maunder minimum candidate.


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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