2001A&A...374..171H


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.29CEST18:14:31

2001A&A...374..171H - Astronomy and Astrophysics, volume 374, 171-181 (2001/7-4)

Surface imaging of HD 199178 (V1794 Cygni).

HACKMAN T., JETSU L. and TUOMINEN I.

Abstract (from CDS):

We present surface temperature maps for the FK Comae-type star HD 199178 (V1794 Cygni) calculated from high resolution spectra obtained in 1994 and 1995. The spot pattern evolves, but all maps reveal a large cool spot remaining nearly at the same high latitude. The main spot is 1200-1600K cooler than the mean surface temperature. The observed slightly flat bottomed absorption lines would usually be interpreted as evidence for a large cool polar spot. We argue that antisolar surface differential rotation offers a better explanation for the box like shape of the line profiles. However, we do not find conclusive evidence for antisolar differential rotation and note that there are still other possible explanations for the slightly flat bottomed line profiles.

Abstract Copyright:

Journal keyword(s): stars: activity, imaging, late-type, starspots, individual: HD 199178

Simbad objects: 6

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Number of rows : 6

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* UX Ari RS* 03 26 35.3764089427 +28 42 54.211100955 7.76 7.28 6.37     K0IV 663 0
2 HD 22468 RS* 03 36 47.2911034958 +00 35 15.938962144 7.09 6.63   5.4   K2:Vnk 1124 0
3 V* HU Vir RS* 12 13 20.6903303051 -09 04 46.844857323   9.69 8.71   7.639 K1V 136 0
4 V* FK Com Ro* 13 30 46.7993742986 +24 13 57.786184235   9.04 8.245   7.204 G4III 348 1
5 CD-33 10685 Or* 15 45 12.8670160092 -34 17 30.646921079 12.47 11.56 10.224 9.60 8.685 K3Ve 220 1
6 HD 199178 Ro* 20 53 53.6522297846 +44 23 11.078229740   7.98 7.24     G5III-IV 200 1

    Equat.    Gal    SGal    Ecl

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2020.09.29-18:14:31

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