2020JAVSO..48..118P

Query : 2020JAVSO..48..118P

2020JAVSO..48..118P - J. Am. Assoc. Variable star obs., 48, 118 (2020/June-0)

Spectroscopic Monitoring of the 2017-2019 Eclipse of VV Cephei.

POLLMANN E. and BENNETT P.

Abstract (from CDS):

VV Cephei is an M supergiant star that eclipses its B-type companion every 20.36 years. It is the eponymous member of the red supergiant + hot main-sequence binaries known as the VV Cephei stars. The red supergiant primary is surrounded by a circumstellar shell due to mass loss via a slow, stellar wind, and this circumstellar material interacts with the hot companion. Spectroscopic observations in the ultraviolet indicate the presence of material accreting onto the hot star from the wind of the M supergiant primary, and the probable presence of an accretion disk around the companion. The hot star and disk produce a local H II "bubble" that results in very prominent H-alpha emission originating from the vicinity of the companion. In this work, we report on a continuing campaign of spectroscopic observations of H-alpha emission from VV Cep over the period 2015-2020 by amateur observers of the ARAS spectroscopy group. We also present a newly discovered 42-day period variability in the equivalent width of this H-alpha emission.

Abstract Copyright: ©2020: The American Association of Variable Star Observers

Journal keyword(s): Eclipsing binary stars - Emission line stars - Massive stars - Amateur astronomers

Status at CDS : Objects in title, abstract, text, figures, and all or part of small table(s) being processed in SIMBAD.

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* VV Cep s*r 21 56 39.1414963149 +63 37 31.981636440 7.03 6.65 4.90 3.19 1.85 M2Ibep+B2?ep_sh 466 0

Query : 2020JAVSO..48..118P

Basic data :
V* VV Cep -- Red Supergiant
Other object types: otypes_help 		* (HD,AG,...), ** (**,CCDM,...), IR (IRAS,IRC,...), SB* (SBC7,SBC9), V* (V*,AAVSO), s*r (1926ApJ), LP* (2017ARep), EB* (2017ARep), Em* ([KW97]), NIR (2MASS), MIR (WISE)
ICRS coord. (ep=J2000) : 		21 56 39.1414963149 +63 37 31.981636440 (Optical) [ 0.0925 0.1078 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		21 55 14.4264239907 +63 23 13.244978289 [ 0.0925 0.1078 90 ]
Gal coord. (ep=J2000) : 		104.9191073578767 +07.0460878850985 [ 0.0925 0.1078 90 ]
Proper motions mas/yr : 		-1.066 -0.425 [0.126 0.112 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -18.7 [0.9] / z(~) -0.000062 [0.000003] / cz -18.70 [0.90]
   E 1953GCRV..C......0W
Parallaxes (mas): 		1.0033 [0.1073] A 2020yCat.1350....0G
Spectral type: 		M2Ibep+B2?ep_sh C 1968ApJ...154..923S
Fluxes (9) :
U 7.03 [~] C 2002yCat.2237....0D
B 6.65 [~] C 2002yCat.2237....0D
V 4.90 [~] C 2002yCat.2237....0D
R 3.19 [~] C 2002yCat.2237....0D
G 3.940110 [0.004225] C 2022yCat.1355....0G
I 1.85 [~] C 2002yCat.2237....0D
J 1.226 [0.290] D 2003yCat.2246....0C
H 0.372 [0.178] D 2003yCat.2246....0C
K -0.001 [0.180] D 2003yCat.2246....0C
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Identifiers (44) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 208816 GSC 04266-03252 PLX 5308.00 UBV M 26033
** WRH 36 HIC 108317 PMC 90-93 1458 uvby98 100208816
AG+63 1207 HIP 108317 PPM 23328 V* VV Cep
BD+62 2007 HR 8383 RAFGL 2821 WDS J21567+6338AB
CCDM J21567+6338AB IDS 21538+6309 AB SAO 19753 WEB 19512
CSI+62 2007 1 IRAS 21552+6323 SBC7 883 WISE J215638.90+633731.1
DO 40453 IRC +60333 SBC9 1340 [B10] 5650
FK5 3756 JP11 3418 SKY# 41813 [KW97] 60-38
GC 30731 2MASS J21563917+6337319 TIC 412120154 AAVSO 2153+63
GCRV 13794 N30 4842 TYC 4266-3252-1 Gaia DR3 2216536246703152256
GEN# +1.00208816 PLX 5308 UBV 18792 Gaia DR2 2216536246703152256

References (466 between 1850 and 2026) (Total 466)
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 : 12    Fe/H : 4    Plx : 5    PM : 7    SpT : 10   

   

Observing logs
IUE : 187   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : V* VV Cep

Link by name to the catalogue in VizieR :

HD 208816 AG+63 1207 BD+62 2007 CCDM J21567+6338AB DO 40453
FK5 3756 GSC 04266-03252 HIC 108317 HIP 108317 HR 8383
IRAS 21552+6323 IRC +60333 2MASS J21563917+6337319 PLX 5308 PPM 23328
RAFGL 2821 SAO 19753 TYC 4266-3252-1 uvby98 100208816 V* VV Cep
WDS J21567+6338AB WISE J215638.90+633731.1 Gaia DR3 2216536246703152256 Gaia DR2 2216536246703152256

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