2006A&A...451..147S

Query : 2006A&A...451..147S

2006A&A...451..147S - Astronomy and Astrophysics, volume 451147-155 (2006/5-3)

DQ white-dwarf stars with low C abundance: possible progenitors.

SCOCCOLA C.G., ALTHAUS L.G., SERENELLI A.M., ROHRMANN R.D. and CORSICO A.H.

Abstract (from CDS):

The present paper focuses on the evolution of hydrogen-deficient white dwarfs with the aim of exploring the consequences of different initial envelope structures on the carbon abundances expected in helium-rich, carbon-contaminated DQ white dwarfs. In particular, the evolutionary link between the DQs with low detected carbon abundances and the PG 1159, extreme horizontal branch, and helium-rich R Coronae Borealis (R CrB) stars is explored.We present full evolutionary calculations that take a self-consistent treatment of element diffusion into account as well as expectations for the outer layer chemical stratification of progenitor stars upon entering the white dwarf regime.We find that PG 1159 stars cannot be related to any DQ white dwarfs with low C abundances. Instead, we suggest that the latter could constitute the progeny of the giant, helium-rich R CrB stars.

Abstract Copyright: ∼

Journal keyword(s): stars: evolution - stars: interiors - stars: white dwarfs - stars: abundances

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* MV Sgr RC* 18 44 31.9665722184 -20 57 12.863610864 12.82 13.56 12.00 13.37   B2pec-Hd 111 0

Query : 2006A&A...451..147S

Basic data :
V* MV Sgr -- R CrB Variable
Other object types: otypes_help 		RC* (), * (1971PW&SO,ALS,...), V* (ASAS,V*,...), NIR (DENIS,2MASS), pA* (2007A&A), V*? (SV*), IR (IRAS)
ICRS coord. (ep=J2000) : 		18 44 31.9665722184 -20 57 12.863610864 (Optical) [ 0.0195 0.0165 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		18 41 33.0291582376 -21 00 19.607530098 [ 0.0195 0.0165 90 ]
Gal coord. (ep=J2000) : 		013.4020930615282 -07.9337090202563 [ 0.0195 0.0165 90 ]
Proper motions mas/yr : 		-4.681 -7.746 [0.023 0.019 90] A 2020yCat.1350....0G
Parallaxes (mas): 		0.0956 [0.0194] A 2020yCat.1350....0G
Spectral type: 		B2pec-Hd D 1982JApA....3...79R
Fluxes (11) :
U 12.82 [~] D 2003AJ....125.2531R
B 13.56 [0.06] D 2012yCat.1322....0Z
V 12.00 [~] C 2002yCat.2237....0D
R 13.37 [0.10] E 2012yCat.1322....0Z
G 13.309357 [0.005024] C 2020yCat.1350....0G
J 11.054 [0.023] C 2003yCat.2246....0C
H 9.856 [0.024] C 2003yCat.2246....0C
K 8.873 [0.022] C 2003yCat.2246....0C
g 13.39 [0.05] D 2012yCat.1322....0Z
r 13.38 [0.06] D 2012yCat.1322....0Z
i 13.39 [0.09] D 2012yCat.1322....0Z
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Identifiers (18) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

SV* HV 4168 GSC2 S303213365 Renson 48510 AAVSO 1838-21
ALS 5123 GSC 06292-00334 TIC 4912062 Gaia DR3 4079834931105467392
ASAS J184432-2057.2 IRAS 18415-2100 UCAC4 346-161178 Gaia DR2 4079834931105467392
CSI-21-18416 LS 5123 V* MV Sgr
DENIS J184431.9-205712 2MASS J18443197-2057127 [DSH2001] 591-16

References (111 between 1850 and 2026) (Total 111)
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

Plx : 2    PM : 2    SpT : 1   

   

Observing logs
IUE : 11   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : V* MV Sgr

Link by name to the catalogue in VizieR :

ALS 5123 DENIS J184431.9-205712 GSC 06292-00334 IRAS 18415-2100 LS 5123
2MASS J18443197-2057127 UCAC4 346-161178 V* MV Sgr Gaia DR3 4079834931105467392 Gaia DR2 4079834931105467392

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