1994A&A...286..824M

Query : 1994A&A...286..824M

1994A&A...286..824M - Astronomy and Astrophysics, volume 286824-828 (1994/6-3)

Near simultaneous BV photometry and Hα spectroscopy of the RS Canum Venaticorum binary DM Ursae Majoris.

MOHIN S. and RAVEENDRAN A.V.

Abstract (from CDS):

Differential BV photometry of DM UMa obtained over 19 nights and near simultaneous Hα spectroscopy obtained over 7 nights during the 1990-91 observing season are presented. From an analysis of the available data we find that the light curve of DM UMa shows both periods of small and large amplitudes with remarkable changes in its mean light level. Apparently, the amplitude of light variation does not depend either on the mean brightness of the system, or on its {DELTA}Vmax or {DELTA}Vmin. The phases of light minima are found to lie on four well separated lines with different slopes. We find that the lifetime of a spot or spot group can be as short as two years. The modelling indicates the presence of spots at high latitudes. The Hα emission equivalent width in DM UMa shows a modulation with the photometric phase so that the maximum emission equivalent width is close to the minimum of the light curve. The spectrum of DM UMa obtained on 1991 Jan 7 shows strong evidence of a flare.

Abstract Copyright: ∼

Journal keyword(s): stars: individual: DM UMa - stars: activity - stars: chromospheres - binaries: spectroscopic - stars: late type

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* DM UMa RS* 10 55 43.5438405648 +60 28 09.721480656   10.31 9.29     K0III-IV 176 0

Query : 1994A&A...286..824M

Basic data :
V* DM UMa -- RS CVn Variable
Other object types: otypes_help 		RS* (), * (BD,AG,...), X (2A,1E,...), SB* (CABS,CCABS,...), V* (V*,AAVSO), Rad (RFC), UV (2RE), NIR (2MASS)
ICRS coord. (ep=J2000) : 		10 55 43.5438405648 +60 28 09.721480656 (Optical) [ 0.0111 0.0113 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		10 52 36.4616937659 +60 44 11.006276558 [ 0.0111 0.0113 90 ]
Gal coord. (ep=J2000) : 		145.3589978751165 +51.3228764064451 [ 0.0111 0.0113 90 ]
Proper motions mas/yr : 		-37.912 -7.566 [0.014 0.014 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -8.03 [0.29] / z(~) -0.000027 [0.000001] / cz -8.03 [0.29]
   A 2004MNRAS.349.1069K
Parallaxes (mas): 		5.3862 [0.0157] A 2020yCat.1350....0G
Spectral type: 		K0III-IV C 2009A&ARv..17..251S
Fluxes (6) :
B 10.31 [0.03] D 2000A&A...355L..27H
V 9.29 [0.01] D 2000A&A...355L..27H
G 8.909824 [0.003358] C 2020yCat.1350....0G
J 7.194 [0.029] C 2003yCat.2246....0C
H 6.621 [0.033] C 2003yCat.2246....0C
K 6.487 [0.038] C 2003yCat.2246....0C
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Identifiers (35) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

BD+61 1211 H 1052+60 RX J1055.7+6028 WEB 9697
2A 1052+606 HIC 53425 1RXS J105544.0+602810 [BM83] X1052+607
AG+60 756 HIP 53425 SAO 15338 [FS2003] 0572
CABS 91 2MASS J10554352+6028096 SAX J1055.7+6028 [ZEH2003] RX J1055.7+6028 1
CCABS 75 PPM 17646 SBC9 643 AAVSO 1049+61
1E 1052.6+6044 RBS 920 TIC 99817388 Gaia DR3 861644351670829568
1ES 1052+60.7 2RE J105539+602803 TYC 4145-504-1 Gaia DR1 861644347374976384
GSC 04145-00504 2RE J1055+602 uvby98 006101211 V Gaia DR2 861644351670829568
1H 1051+607 RFC J1055+6028 V* DM UMa

References (176 between 1850 and 2026) (Total 176)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 2    Diameter : 1    Distance : 2    Rot : 2    Plx : 5    PM : 5    SpT : 1   

   

Observing logs
IUE : 7   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : V* DM UMa

Link by name to the catalogue in VizieR :

BD+61 1211 AG+60 756 CABS 91 GSC 04145-00504 HIC 53425
HIP 53425 2MASS J10554352+6028096 PPM 17646 2RE J105539+602803 2RE J1055+602
1RXS J105544.0+602810 SAO 15338 TYC 4145-504-1 uvby98 006101211 V V* DM UMa
Gaia DR3 861644351670829568 Gaia DR1 861644347374976384 Gaia DR2 861644351670829568

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