2002A&A...381..517A


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.07CET20:30:01

2002A&A...381..517A - Astronomy and Astrophysics, volume 381, 517-523 (2002/1-2)

Photometric and TiO modelling of the starspots on AG Dor and HU Vir.

AMADO P.J. and ZBORIL M.

Abstract (from CDS):

In this work, spot parameters are determined for two stars, namely, AG Dor and HU Vir, from their photometric variability and λ7055Å TiO band depth. Applying the photometric modelling code spotpic, we have found two modulating spots together with a non-modulating component on the photosphere of AG Dor in December 96/January 97. The spot temperatures are constrained to be between 4300K and 4600K for the modulating component, and cooler, viz., 4000K, for the non-modulating one. Therefore, the non-modulating component of the spot distribution on AG Dor at this epoch is held to be totally responsible for the presence of the TiO band in the spectra of this K1 dwarf with photospheric temperature of 5000K. AG Dor's total coverage of spots is determined to be between 4% and 7% for the modulating component and 26.5% for the non-modulating one. For HU Vir, the light and colour curves were modelled with two spots with temperatures of 4450 and 4050K. In this case we did not include the non-modulating component in the model.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: late-type - stars: variables - stars: individual: AG Dor - stars: individual: HU Vir

Simbad objects: 13

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Number of rows : 13

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 V* V Hor LP* 03 03 28.3718177242 -58 55 58.956151020   8.71 8.70     M5-III 31 0
2 HD 19826 PM* 03 10 35.3881704052 -23 44 18.606939682   7.320 6.377     G9III-IV 35 0
3 * tau04 Eri LP* 03 19 31.0022373 -21 45 28.304953 7.13 5.32 3.70 2.12 0.66 M3III-IIIaCa-1 105 0
4 V* AG Dor RS* 04 07 29.1816721659 -52 34 17.293643629   9.50 8.595   7.526 K2IV-Vk 82 0
5 V* EI Eri RS* 04 09 40.8929265498 -07 53 34.177328732   7.71 7.04     G3V 270 0
6 * l Eri ** 04 38 10.8240964091 -14 18 14.483465432 5.99 4.96 3.87 3.03 2.47 K2-IIIb 128 0
7 V* V1005 Ori BY* 04 59 34.8341800543 +01 47 00.672080375   11.48 10.107 9.603 8.239 M0Ve 308 0
8 HD 33555 RG* 05 10 58.0244035598 -02 15 14.811824245   7.233 6.236     K1-IV 37 0
9 V* TZ Col RS* 05 52 15.9885946977 -28 39 24.914638055   9.67 9.082   8.366 G3V 46 1
10 V* YZ CMi Er* 07 44 40.1726285952 +03 33 08.877830321 13.761 12.831 11.225 9.958 8.263 M4.0Ve 795 0
11 V* TY Pyx RS* 08 59 42.7216317719 -27 48 58.694776546 7.82 7.56 6.87     G5V 248 0
12 V* HU Vir RS* 12 13 20.6903303051 -09 04 46.844857323   9.69 8.71   7.639 K1V 139 0
13 V* BY Dra BY* 18 33 55.7719224141 +51 43 08.903033617 10.22 9.23   8.733   K4Ve+K7.5Ve 598 0

    Equat.    Gal    SGal    Ecl

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2021.03.07-20:30:02

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