2001A&A...375..492V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST23:13:34

2001A&A...375..492V - Astronomy and Astrophysics, volume 375, 492-497 (2001/8-4)

The coronal FeXXI λ1354.094 line in AB Doradus.

VILHU O., MUHLI P., MEWE R. and HAKALA P.

Abstract (from CDS):

The active late-type star AB Doradus was observed in February 1996 with the Goddard High Resolution Spectrograph of the Hubble Space Telescope using the low resolution G140L grating. The observations covered one half of the star's rotation cycle (P=0.514d) with 11.5min time resolution. The strong coronal FeXXI λ1354.094 line formed at 107K was analysed and its emission measure (EM) derived. This EM is much higher than that derived from recent XMM-Newton observations (Guedel et al., 2001A&A...365L.336G), and earlier EXOSAT (Collier Cameron et al., 1988MNRAS.231..131C) and ASCA/EUVE (Mewe et al., 1996A&A...315..170M) data, as well, requiring a variability by a factor of 5. The physical reason for the variability remains unknown, since (outside flares) the observed broad band variability of AB Dor is much smaller.

Abstract Copyright:

Journal keyword(s): stars: coronae - stars: activity - stars: individual: AB Dor - ultraviolet: stars

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 - 2020
#notes
1 HD 22468 RS* 03 36 47.2911034958 +00 35 15.938962144 7.09 6.63   5.4   K2:Vnk 1124 0
2 * alf Aur SB* 05 16 41.35871 +45 59 52.7693 1.33 0.88 0.08 -0.52 -0.96 G3III: 1137 0
3 V* AB Dor TT* 05 28 44.8916324761 -65 26 55.289846904 8.259 7.856 6.999 6.496 5.993 K0V 931 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-23:13:34

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