2001A&A...376..966T


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.28CET21:04:56

2001A&A...376..966T - Astronomy and Astrophysics, volume 376, 966-977 (2001/9-4)

BVR photometry and Hα spectroscopy of RS CVn type binary MM Herculis.

TAS G., EVREN S., MARINO G., FRASCA A., IBANOGLU C. and CATALANO S.

Abstract (from CDS):

The RS CVn type eclipsing binary MM Herculis was observed photo-electrically using B, V and R filters in 1998 and 1999 and the light and colour curves were obtained. Spectroscopic observations were carried out in 1999. The new light and colour curves are anti-correlated with the observations of 1997, i.e. the system is bluer when it is faintest. The variations of the brightnesses at each special phase (0.0, 0.25, 0.5, and 0.75) show an almost cyclic change with a period of about 6 years. This value is in good agreement with the migration periods of the spots suggested by us previously. The outside-of-eclipse wave in the light curve shows a minimum at phase ≃0.50, and the mean colour of the system is the bluest at the same phase. When the spots located on the cooler component are seen around phase 0.50, the amplitude of the light variation outside eclipse is larger than the others. Such variation may be caused by the effect of the hotter component. Spectroscopic observations of the system were carried out in the spectral range 5860-6700Å. The subtraction of a ``synthetic'' spectrum, built up with spectra of inactive standard stars, allows us to detect an Hα emission excess only from the cool component. New radial velocity measurements of the system were obtained and analyzed for the orbital parameters.

Abstract Copyright:

Journal keyword(s): activity - MM Her - late type - starspots

Simbad objects: 18

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Number of rows : 18

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 HD 8357 XB* 01 22 56.7569725665 +07 25 09.324761789 8.530 8.160   6.8   G5 158 0
2 V* XX Tri RS* 02 03 47.1138016857 +35 35 28.669244792   9.52 8.42     K0III 120 0
3 * alf Ari PM* 02 07 10.40570 +23 27 44.7032 4.29 3.17 2.01 1.15 0.54 K2-IIIbCa-1 609 1
4 V* UX Ari RS* 03 26 35.3764089427 +28 42 54.211100955 7.76 7.28 6.37     K0IV 668 0
5 HD 22468 RS* 03 36 47.2911034958 +00 35 15.938962144 7.09 6.63   5.4   K2:Vnk 1132 0
6 * del Eri RS* 03 43 14.9008787 -09 45 48.208444 5.13 4.46 3.54 2.82 2.32 K0+IV 551 0
7 V* EI Eri RS* 04 09 40.8929265498 -07 53 34.177328732   7.71 7.04     G3V 270 0
8 * sig Gem RS* 07 43 18.7269793 +28 53 00.642191 6.38 5.41 4.29 3.37 2.79 K1IIIe 450 0
9 V* RS CVn RS* 13 10 36.9078781154 +35 56 05.587686902 8.57 8.51 7.93 7.7   F6IV+G8IV 689 0
10 V* MM Her RS* 17 58 38.5192261661 +22 08 46.786202620   9.24 9.563 8.01 8.574 G0 131 0
11 HD 164306 * 17 59 40.1262664609 +22 04 14.641326571   8.37 8.37     A0 10 0
12 HD 341480 ** 18 00 17.9269091757 +21 53 47.322477360   9.20 8.53     G0 16 0
13 V* V1762 Cyg RS* 19 08 25.7904391348 +52 25 32.630339536   6.982 5.893     K1IV 199 0
14 * kap Del PM* 20 39 07.7860368187 +10 05 10.279480343   5.77   4.6   G2IV 187 0
15 V* HK Lac RS* 22 04 56.6089126762 +47 14 04.482220545   8.01 6.96     K0III 232 0
16 V* AR Lac RS* 22 08 40.8180372773 +45 44 32.104045703 7.09 6.83 6.11     K0IVe+G5IV 699 0
17 * 51 Peg Ro* 22 57 27.9804167474 +20 46 07.782240714 6.39 6.16 5.46 4.97 4.61 G2IV 1089 1
18 HD 224085 RS* 23 55 04.0516465022 +28 38 01.248194500 8.88 8.20   6.9   K2+IVeFe-1 690 0

    Equat.    Gal    SGal    Ecl

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