1998A&A...330.1029W


Query : 1998A&A...330.1029W

1998A&A...330.1029W - Astronomy and Astrophysics, volume 330, 1029-1040 (1998/2-3)

Doppler imaging of stellar surface structure. V. The long-period RS CVn binary HD 81410 = IL Hydrae.

WEBER M. and STRASSMEIER K.G.

Abstract (from CDS):

Multiwavelength Doppler images of the long-period RS CVn binary IL Hydrae from March 1994 and Feb.-March 1995 reveal a cool polar spot and several features at low latitudes. Their average temperature is approximately 500K below the photospheric temperature of 4700K. Due to the relatively small rotational velocity of 26.5±1km/s and the relatively cool, low-gravity atmosphere with many weak absorption blends, Doppler imaging of IL Hydrae is challenging but resulted in encouragingly similar maps from altogether seven spectral regions near 6400Å. Latitude-dependent differential rotation is detected from our Doppler maps and indicate faster rotation at the stellar equator as compared to the polar regions. Lines from the secondary component are sometimes seen in our red-wavelength spectra and a double-lined spectroscopic orbit is presented. We also give a more precise rotational period from three consecutive years of V-band photometry. A spectral classification of K0III-IV and a mass of 2.2±0.2M for the primary, and mid to late F main sequence or maybe ≃G0V-IV and a mass of 1.3±0.2M for the secondary, are suggested. Hα equivalent widths measured over a single rotation cycle exhibit a sinusoidal variation in phase with the photospheric V-band light curve. The maximum of the residual Hα emission coincides with the lightcurve minimum and is thus likely linked to the starspot-covered stellar surface. A steady, redshifted absorption component possibly indicates an isotropic inward flow at the Hα line-forming region at approximately 60km/s.

Abstract Copyright:

Journal keyword(s): stars: activity of - stars: imaging - stars: individual: IL Hya - stars: late-type - binaries: spectroscopic

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* OP And RS* 01 36 27.2005869192 +48 43 22.000439676   7.47 6.22     K1III: 97 0
2 V* XX Tri RS* 02 03 47.1141597864 +35 35 28.665702672   9.52 8.42     K0III 122 0
3 V* VY Ari RS* 02 48 43.7287212960 +31 06 54.592447356   7.72   6.4   G9 213 0
4 V* UX Ari RS* 03 26 35.3756804760 +28 42 54.226408428 7.76 7.28 6.37     K0IV 676 0
5 HD 22468 RS* 03 36 47.2911034958 +00 35 15.938962144 7.09 6.79 5.90 5.4   K2:Vnk 1146 0
6 V* V660 Tau Er* 03 48 28.0289494248 +23 18 02.731712616   13.66 12.60   11.43 K2V 85 0
7 V* V471 Tau EB* 03 50 24.9666549840 +17 14 47.430910716   10.258 9.373   8.393 K2V+DA 639 0
8 V* EI Eri RS* 04 09 40.8923562192 -07 53 34.175993568   7.71 7.04     G3V 275 0
9 V* V410 Tau Or* 04 18 31.1081296680 +28 27 16.155955728   12.13 10.75 8.45 9.408 K3Ve 444 0
10 V* YY Men Ro* 04 58 17.9369735112 -75 16 37.987856868   9.11 8.05     K1IIIp 123 0
11 * alf Aur SB* 05 16 41.35871 +45 59 52.7693 1.33 0.88 0.08 -0.52 -0.96 G3III: 1159 0
12 V* AB Dor TT* 05 28 44.8712165880 -65 26 55.199147208 8.259 7.856 6.999 6.496 5.993 K0V 975 0
13 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1075 1
14 * G CMi PM* 08 02 15.9369212008 +02 20 04.458846354 6.91 5.63 4.38 3.39 2.72 K2IIIbFe-0.5: 177 1
15 HD 80991 * 09 22 31.0797188784 -22 31 08.503812804   9.54 8.51     K0III 23 0
16 V* IL Hya RS* 09 24 49.0136973144 -23 49 34.714396272   8.38 7.37     K2IV/Vp 164 0
17 HD 81904 * 09 27 58.1447995440 -23 40 45.636819780   8.98 8.02     G8/K0III 24 0
18 V* DM UMa RS* 10 55 43.5438405648 +60 28 09.721480656   10.31 9.29     K0III-IV 162 0
19 V* HU Vir RS* 12 13 20.6914862928 -09 04 46.880926320   9.69 8.71   7.639 K1V 140 0
20 * c Vir RG* 12 20 20.9813922197 +03 18 45.255217001 7.27 6.12 4.96 4.07 3.46 K0.5IIIbFe-0.5 352 0
21 PN LoTr 5 PN 12 55 33.7471108416 +25 53 30.559286040   9.72 8.88     G5III-IV 202 0
22 V* IN Vir RS* 13 24 24.1561749744 -02 18 54.937707948   10.33 9.131   7.900 K2III 58 0
23 V* FK Com PM* 13 30 46.7996390256 +24 13 57.781233768   9.04 8.245   7.204 G4III 361 1
24 V* UZ Lib SB* 15 32 23.2091053080 -08 32 00.933064764   10.12 9.115   7.904 K0III 115 1

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2022.05.20-19:01:11

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