2003A&A...404..355G


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.11CET22:26:08

2003A&A...404..355G - Astronomy and Astrophysics, volume 404, 355-364 (2003/6-2)

The corona of V390 Aurigae (HD 33798).

GONDOIN P.

Abstract (from CDS):

V390 Aurigae (HD 33798) is a rapidly rotating, lithium rich, late-type giant whose distinctive characteristics include a high X-ray luminosity observed by the XMM-Newton space observatory. Series of lines of highly ionized Fe and several Lyman lines of hydrogen-like ions and triplet lines of helium-like ions are visible in the reflection grating spectra, most notably from O and Ne. X-ray emission from plasma at high temperature (T>107K) indicates intense flaring activity on this star. Analysis results suggest a scenario where the corona of V390 Aurigae is dominated by large magnetic structures similar in size to interconnecting loops between solar active regions but significantly hotter. The interaction of these structures could explain the permanent flaring activity on large scales that is responsible for heating plasma to high temperatures. The intense activity on V390 Aurigae is related to its evolutionary position at the bottom of the red giant branch. It is anticipated that the rotation of the star will spin-down in the future, thus decreasing the efficiency of its α-Ω dynamo with the suppressing of large scale magnetic structures in its corona.

Abstract Copyright:

Journal keyword(s): stars: individual: V390 Aurigae - stars: activity - stars: coronae - stars: evolution - stars: late-type - X-ray: stars

Simbad objects: 2

goto Full paper

goto View the reference in ADS

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 - 2020
#notes
1 V* V390 Aur BY* 05 15 15.45749 +47 10 14.6314   7.90 6.92     G5III 70 1
2 * kap Gem ** 07 44 26.8535692 +24 23 52.787227 5.19 4.49 3.57 2.86 2.41 G8III-IIIb 282 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2003A&A...404..355G and select 'bookmark this link' or equivalent in the popup menu


2019.11.11-22:26:08

© Université de Strasbourg/CNRS

    • Contact