2000A&A...360..281D

Query : 2000A&A...360..281D

2000A&A...360..281D - Astronomy and Astrophysics, volume 360281-289 (2000/8-1)

ORFEUS II echelle spectra: on the influence of iron-group line blanketing in the Far-UV spectral range of hot subdwarfs.

DEETJEN J.L.

Abstract (from CDS):

We present an analysis of the subdwarf O star Feige 67 with a fully metal-line blanketed NLTE model atmosphere based on high-resolution Far-UV (912-2000Å) and Near-UV (2000-3400Å) spectra from new ORFEUS II echelle observations and the IUE final archive. The Far-UV spectra are heavily blanketed by iron and nickel lines, preventing the detection of the stellar continuum and complicating the abundance analysis. Important points concerning the account for blanketing by millions of iron-group lines and for an accurate determination of iron and nickel abundances are discussed: The usage of all theoretically and experimentally known line opacities of the iron-group elements, the consideration of a broad wavelength range for a reliable determination of the stellar continuum flux, and the role of interstellar reddening. This paper outlines a basic approach for spectral analysis of future high-resolution Far-UV spectra of hot compact stars. During this study we re-analyzed the iron and nickel abundance of our exemplary object Feige 67 and confirm their extraordinary amount.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - stars: atmospheres - stars: evolution - stars: individual: Feige 67 - stars: subdwarfs - ultraviolet: stars

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 BD+18 2647 HS* 12 41 51.7899961800 +17 31 19.750566756 10.261 11.70 11.63 11.969 12.159 sdOpec 185 1

Query : 2000A&A...360..281D

Basic data :
BD+18 2647 -- Hot Subdwarf
Other object types: otypes_help 		* (BD,GEN#,...), UV (FAUST,GALEX,...), blu (2019A&A,FB,...), HS* (1958ApJ), NIR (2MASS)
ICRS coord. (ep=J2000) : 		12 41 51.7899961800 +17 31 19.750566756 (Optical) [ 0.0549 0.0328 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		12 39 21.8061250082 +17 47 48.042519433 [ 0.0549 0.0328 90 ]
Gal coord. (ep=J2000) : 		289.4788167539028 +80.1428865239758 [ 0.0549 0.0328 90 ]
Proper motions mas/yr : 		-7.170 -37.278 [0.091 0.088 90] A 2020yCat.1350....0G
Parallaxes (mas): 		2.9149 [0.0735] A 2020yCat.1350....0G
Spectral type: 		sdOpec D 1958ApJ...128..267F
Fluxes (9) :
U 10.261 [~] D 2007AJ....133..768L
B 11.70 [0.08] D 2000A&A...355L..27H
V 11.63 [0.12] D 2000A&A...355L..27H
R 11.969 [~] D 2007AJ....133..768L
G 11.754736 [0.002879] C 2020yCat.1350....0G
I 12.159 [~] D 2007AJ....133..768L
J 12.504 [0.023] C 2003yCat.2246....0C
H 12.697 [0.030] C 2003yCat.2246....0C
K 12.747 [0.032] C 2003yCat.2246....0C
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Identifiers (27) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

BD+18 2647 GSC 01446-02473 TD1 30996 uvby98 001802647
FAUST 3385 GSC 01446-00791 TIC 460815638 [BFA97] 162
FAUST NGP-64 HIC 61958 TYC 1446-2473-1 [TFW97] J124151.79+173119.93
FB 106 HIP 61958 UBV 9577 [VKN2011] J124151.8+173119
Feige 67 2MASS J12415179+1731197 UBV M 43322 Gaia DR3 3935488605023787392
GALEX J124151.8+173118 PG 1239+178 UBV M 895 Gaia DR2 3935488605023787392
GEN# +0.01802647 PLX 2925.01 UBV 11386

References (185 between 1850 and 2026) (Total 185)
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

Distance : 2    Fe/H : 1    Plx : 5    PM : 4    SpT : 6   

   

Observing logs
IUE : 8    XMM : 1   

   

External archives :

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

Link by name to the catalogue in VizieR :

BD+18 2647 FAUST 3385 FAUST NGP-64 GALEX J124151.8+173118 GSC 01446-02473
GSC 01446-00791 HIC 61958 HIP 61958 2MASS J12415179+1731197 PG 1239+178
TD1 30996 TYC 1446-2473-1 uvby98 001802647 Gaia DR3 3935488605023787392 Gaia DR2 3935488605023787392

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