2021JAVSO..49...32W

Query : 2021JAVSO..49...32W

2021JAVSO..49...32W - J. Am. Assoc. Variable star obs., 49, 32 (2021)

A Spectroscopic Study of the Variable Star T Centauri Over a 91-day Cycle, and the Effects of Titanium Oxide on Its Atmosphere.

WEST J.F. and PACE B.

Abstract (from CDS):

We observed spectra of the large amplitude semiregular variable T Centauri during a complete 91-day period, which were subsequently combined with contemporaneous photometric data from the AAVSO International Database. The analysis of these data, together with other reference material, has enabled us to estimate a mean photospheric radius of T Centauri at ∼ 94 Rsun, and to develop a simple model reflecting the effects of the formation of titanium oxide in the star's atmosphere as it cools through minimum brightness. Our model incorporated the variation in atmospheric opacity due to TiO and, in comparison with the observed magnitudes, indicated an increase of 20-40% in the apparent stellar radius, as observed in the visual and near-infrared bands as the star cooled mid-phase.

Abstract Copyright: ∼

Journal keyword(s): Spectroscopy - Photometry - Stellar atmospheric opacity - Mira variable stars - Stars: individual (T Cen)

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* T Cen Mi* 13 41 45.5635339752 -33 35 50.560017864 8.59 7.49 6.05     K5-M4e 77 0

Query : 2021JAVSO..49...32W

Basic data :
V* T Cen -- Mira Variable
Other object types: otypes_help 		* (HD,CD,...), V* (V*,AAVSO), IR (IRAS,RAFGL), Mi* (2009yCat), NIR (2MASS)
ICRS coord. (ep=J2000) : 		13 41 45.5635339752 -33 35 50.560017864 (Optical) [ 0.0494 0.0529 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		13 38 53.1832815641 -33 20 42.811529880 [ 0.0494 0.0529 90 ]
Gal coord. (ep=J2000) : 		314.8017220229432 +28.1118591201568 [ 0.0494 0.0529 90 ]
Proper motions mas/yr : 		-27.747 3.365 [0.064 0.058 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 27.6 [0.9] / z(~) 0.000092 [0.000003] / cz 27.60 [0.90]
   E 1953GCRV..C......0W
Parallaxes (mas): 		2.4007 [0.0687] A 2020yCat.1350....0G
Spectral type: 		K5-M4e B 1966ApJS...13..333K
Fluxes (7) :
U 8.59 [~] C 2002yCat.2237....0D
B 7.49 [~] C 2002yCat.2237....0D
V 6.05 [~] C 2002yCat.2237....0D
G 5.933962 [0.033434] C 2020yCat.1350....0G
J 3.40 [~] C 2002yCat.2237....0D
H 2.67 [~] C 2002yCat.2237....0D
K 2.40 [~] C 2002yCat.2237....0D
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Identifiers (24) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 119090 GEN# +1.00119090 2MASS J13414557-3335505 TYC 7270-2311-1
CD-32 9549 GSC 07270-02311 PPM 291701 V* T Cen
CPC 17 6946 HIC 66825 RAFGL 4909S WEB 11781
CPD-32 3458 HIP 66825 SAO 204739 AAVSO 1336-33
GC 18505 HR 5147 SKY# 25176 Gaia DR3 6165341341986059520
GCRV 8094 IRAS 13388-3320 TIC 102041504 Gaia DR2 6165341341986059520

References (77 between 1850 and 2026) (Total 77)
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 : 10    Distance : 2    Plx : 4    PM : 5    SpT : 16   

   

Observing logs
IUE : 3   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : V* T Cen

Link by name to the catalogue in VizieR :

HD 119090 CD-32 9549 CPD-32 3458 GSC 07270-02311 HIC 66825
HIP 66825 HR 5147 IRAS 13388-3320 2MASS J13414557-3335505 PPM 291701
RAFGL 4909S SAO 204739 TYC 7270-2311-1 V* T Cen Gaia DR3 6165341341986059520
Gaia DR2 6165341341986059520

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