2020MNRAS.496.2558F

Query : 2020MNRAS.496.2558F

2020MNRAS.496.2558F - Mon. Not. R. Astron. Soc., 496, 2558-2564 (2020/August-2)

Opacity modelling of heavy-metal hot subdwarfs: photoionization of Sr0, Y+, and Zr^2 +^.

FERNANDEZ-MENCHERO L., JEFFERY C.S., RAMSBOTTOM C.A. and BALLANCE C.P.

Abstract (from CDS):

Heavy-metal hot subdwarfs (sdB and sdO) represent a small group of stars with unusually high concentrations of trans-iron elements in their atmospheres, having abundances ∼10 000 times solar. One example is LS IV-14 116, where a number of heavy-metal absorption lines of Sr II, Y III, and Zr IV have been observed in the optical band 4000-5000 Å. We use a fully relativistic Dirac Atomic R-Matrix Code (DARC) to calculate photoionization cross-sections of Sr0, Y+, and Zr^2 +^ from their ground state to the 20th excited level. We use the cross-sections and the oscillator strengths to simulate the spectrum of a hot subdwarf. We obtain complete sets of photoionization cross-sections for the three ions under study. We use these data to calculate the opacity of the stellar atmospheres of hot subdwarf stars, and show that for overabundances observed in some heavy-metal subdwarves, photoexcitation from zirconium, in particular, does contribute some back warming in the model.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): atomic data - stars: abundances - opacity

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

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 LS IV -14 116 HS* 20 57 38.8746228912 -14 25 43.991016852 11.63 12.73 13.02 13.28   sdB0.5VIIHe18 89 0

Query : 2020MNRAS.496.2558F

Basic data :
LS IV -14 116 -- Hot Subdwarf
Other object types: otypes_help 		* (2013MNRAS,UCAC2,...), blu (2019A&A), HS* (1992MNRAS), PM* (2018yCat), V* (V*), UV (GALEX), NIR (2MASS)
ICRS coord. (ep=J2000) : 		20 57 38.8746228912 -14 25 43.991016852 (Optical) [ 0.0478 0.0307 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		20 54 52.6322052982 -14 37 14.687055586 [ 0.0478 0.0307 90 ]
Gal coord. (ep=J2000) : 		033.5786123395200 -34.3775849256333 [ 0.0478 0.0307 90 ]
Proper motions mas/yr : 		7.409 -128.265 [0.056 0.041 90] A 2020yCat.1350....0G
Parallaxes (mas): 		2.3406 [0.0543] A 2020yCat.1350....0G
Spectral type: 		sdB0.5VIIHe18 B 2013A&A...551A..31D
Fluxes (8) :
U 11.63 [~] D 2013MNRAS.431..240O
B 12.73 [~] D 2013MNRAS.431..240O
V 13.02 [~] D 2013MNRAS.431..240O
R 13.28 [0.07] E 2012yCat.1322....0Z
G 12.946762 [0.002817] C 2020yCat.1350....0G
J 13.638 [0.027] C 2003yCat.2246....0C
H 13.80 [0.03] C 2003yCat.2246....0C
K 13.90 [0.05] C 2003yCat.2246....0C
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Identifiers (13) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

UCAC2 26794502 GALEX J205738.7-142545 UCAC4 378-169675 Gaia DR2 6886766582082317440
ALS 11634 LS IV -14 116 uvby98 854140116
CSI-14-20549 2MASS J20573887-1425437 V* V366 Aqr
EC 20548-1437 TIC 442482669 Gaia DR3 6886766582082317440

References (89 between 1850 and 2026) (Total 89)
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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Distance : 2    Fe/H : 2    Plx : 2    PM : 2    SpT : 6   

   

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

Link by name to the catalogue in VizieR :

UCAC2 26794502 ALS 11634 GALEX J205738.7-142545 LS IV -14 116 2MASS J20573887-1425437
UCAC4 378-169675 uvby98 854140116 V* V366 Aqr Gaia DR3 6886766582082317440 Gaia DR2 6886766582082317440

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