2001A&A...370..218W


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.28CET07:12:26

2001A&A...370..218W - Astronomy and Astrophysics, volume 370, 218-229 (2001/4-4)

A study of the chromospherically active binaries UX Fornacis and AG Doradus.

WASHUETTL A. and STRASSMEIER K.G.

Abstract (from CDS):

This paper presents a time-series spectrum analysis of the two chromospherically active binary stars, UX Fornacis and AG Doradus. To investigate the rotational behaviour, in combination with activity in the Hα line, we obtained almost 40 high-resolution, high-S/N spectra for each system. Both binaries, UX For and AG Dor, show Hα of the primary star in absorption but filled in by chromospheric emission while the Hα line of the secondaries appear in pure emission. Line variations are seen and are approximately 5-σ detections but are not linked to the orbital nor the rotational periods and seem to be erratic. We obtained new orbital elements for both systems and used them in combination with Hipparcos parallaxes and our Hα-spectrum synthesis to determine absolute parameters. We present the first Doppler image of the AG Dor primary using line-profile variations of the FeI λ6546 line. The image reveals a cool polar feature and three equatorial spots with an average surface temperature difference, photosphere minus spots, of up to 1500K for the polar spot and ≃800K for the equatorial spots. Since AG Dor is one of the slowest rotators (vsini=18km/s) that has ever been Doppler imaged, we present several tests to demonstrate the external consistency of our map.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: atmospheres - stars: imaging - stars: individual: AG Dor, UX For - stars: late-type - binaries: close

Simbad objects: 9

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Number of rows : 9

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 * phi Eri PM* 02 16 30.5856318 -51 30 43.795513 3.06 3.45 3.57 3.64 3.75 B8IV 136 0
2 V* UX For RS* 02 43 25.5661088351 -37 55 42.027954989   8.77 8.055   7.165 G5/8V+(G) 78 0
3 HD 17925 RS* 02 52 32.1281853696 -12 46 10.970649463 7.48 6.91 6.05 5.34 4.89 K1V 474 0
4 V* V471 Tau Al* 03 50 24.9664598642 +17 14 47.433240686   10.258 9.373   8.393 K2V+DA 617 0
5 HD 25069 RG* 03 58 52.3938998575 -05 28 11.810156197   6.848 5.833     K0/1III 64 0
6 V* AG Dor RS* 04 07 29.1816721659 -52 34 17.293643629   9.50 8.595   7.526 K2IV-Vk 80 0
7 * bet Lep ** 05 28 14.7231588 -20 45 33.987791 4.13 3.66 2.84 2.19 1.75 G5II-IIIa: 229 0
8 * 12 Mon V* 06 32 19.2036760299 +04 51 21.597885174 7.600 6.820 5.830     K0III 66 0
9 V* EK Dra BY* 14 39 00.2109485496 +64 17 29.977371998   8.243 7.604     G1.5V 382 0

    Equat.    Gal    SGal    Ecl

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2020.10.28-07:12:26

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