2001A&A...372..260C


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.31CET09:15:03

2001A&A...372..260C - Astronomy and Astrophysics, volume 372, 260-275 (2001/6-2)

Ultraviolet spectra for λ Boo (HD 125162) computed with H2 opacities and Lyman-α H-H and H-H+ opacities.

CASTELLI F. and KURUCZ R.L.

Abstract (from CDS):

New opacity distribution functions (ODF) have been computed for use with the ATLAS9 model atmosphere code of Kurucz. One of the improvements upon the Kurucz (1990, Stellar Atmospheres: Beyond Classical Models, NATO Aso Series, ed. L. Crivellari et al., 441) ODFs is the addition to the line blanketing of the Lyman-α H-H and H-H+ quasi-molecular absorptions near 1600Å and 1400Å. New-ODF fluxes are expected to reproduce the ultraviolet observations of λ Boo stars and metal-poor A-type stars in a more realistic way than previous computations did. In this paper we compare low- and high-resolution IUE observations of λ Boo (HD 125162, HR 5351) with fluxes and synthetic spectra based on ATLAS9 models and new-ODFs, which were computed for [M/H]=-2.0 for all the elements, except CNO. For C, N, and O, abundances log(Nelem/Ntot) equal to -3.85, -3.99, and -3.11, respectively, were adopted. We selected λ Boo in order to compare results from the new-ODFs with those from Allard et al. (1998, Proceedings of the Conference Ultraviolet Astrophysics Beyonnd the IUE Final Archive, ESA SP-413, 105, 1998A&A...335.1124A), who tested their semi-classical computations of the H-H and H-H+ quasi-molecular absorptions on this star. The analysis of the IUE high-resolution spectrum has shown that lines of H2 are a very important source of line opacity for λ Boo shortward 1600Å. When both atomic and molecular lines are considered, the slope of the observed energy distribution is well reproduced in the whole region 1300-3000Å by the new-ODF model, but the H-H quasi-molecular absorption at 1600Å is computed about 10% too strong. The fit of the low-resolution IUE image SWP17872 to a small grid of new-ODF models gives parameters Teff=8650K, logg=4.0, while the fit of the high-resolution image SWP 42081, rebinned at the low resolution wavelength step size, gives parameters Teff=8500K, logg=4.0. These last parameters are in close agreement with Teff=8550K, logg=4.1 obtained by fitting the visible energy distribution. The different IUE images are discussed.

Abstract Copyright:

Journal keyword(s): stars: atmospheres - stars: fundamental parameters - stars: individuals: HD 125162 (λ Boo) - 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 - 2020
#notes
1 * lam Boo dS* 14 16 23.0187965 +46 05 17.900526 4.31 4.26 4.18 4.16 4.13 A0Va_lB 327 0

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2020.10.31CET09:15:03

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


Basic data :
* lam Boo -- Variable Star of delta Sct type
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
* (*,AG,...), IR (AKARI,IRAS,...), PM* (Ref,2018yCat.1345....0G,...), dS* (Ref), UV (TD1)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
14 16 23.0187965 +46 05 17.900526 (Optical) [ 0.11 0.12 90 ] A 2007A&A...474..653V
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
14 14 28.0688842 +46 19 09.970602 [ 0.11 0.12 90 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
086.9803806632 +64.6661790364 [ 0.11 0.12 90 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr :
-187.33 159.05 [0.14 0.11 90] A 2007A&A...474..653V
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) -7.90 [1.6] / z(~) -0.000026 [0.000005] / cz -7.90 [1.60]
   B 2006AstL...32..759G
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas):
32.94 [0.16] A 2007A&A...474..653V
Spectral type is made of 3 parts: %coding is composed of 4 parts :
  • the spectral type, which is made of a temperature class, eventually a luminosity class (roman number) and/or spectral peculiarities;
  • a quality letter: A=best quality→E=worst quality, {� } =unknown quality %
  • a quality letter: A=best quality -> E=worst quality, {� } =unknown quality
  • bibcode : bibcode of the spectral type reference
Spectral type:
A0Va_lB C 1987ApJS...65..581G
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (9) :
U 4.31 [~] C 2002yCat.2237....0D
B 4.26 [~] C 2002yCat.2237....0D
V 4.18 [~] C 2002yCat.2237....0D
R 4.16 [~] C 2002yCat.2237....0D
G 4.0871 [0.0035] C 2018yCat.1345....0G
I 4.13 [~] C 2002yCat.2237....0D
J 3.98 [0.30] D 2003yCat.2246....0C
H 4.03 [0.25] D 2003yCat.2246....0C
K 3.910 [0.036] C 2003yCat.2246....0C
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within radius arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR.
The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!).

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (43) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* lam Boo HD 125162 N30 3235 TYC 3472-1264-1
* 19 Boo HGAM 628 NAME Xuange UBV 12565
AG+46 1040 HIC 69732 NLTT 36818 UBV M 20097
AKARI-IRC-V1 J1416229+460519 HIP 69732 PLX 3246 USNO-B1.0 1360-00237162
ASCC 331916 HR 5351 PLX 3246.00 uvby98 100125162
BD+46 1949 IRAS 14144+4619 PMC 90-93 377 WEB 12142
FK5 527 IRAS F14144+4619 PPM 54024 WISEA J141622.78+460519.8
GC 19273 JP11 2493 ROT 2048 WISE J141622.59+460518.9
GCRV 8355 LSPM J1416+4605 SAO 44965 [DML87] 343
GEN# +1.00125162 LTT 14190 SKY# 26046 Gaia DR2 1505311442256006912
GJ 3837 2MASS J14162308+4605177 TD1 17373

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References (327 between 1850 and 2020) (Total 327)
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


distance : 1    diameter : 1    velocities : 7    ROT : 3    PM : 7    Fe_H : 4    PLX : 4    MK : 11   

   

Observing logs


ISO : 4    herschel : 5    IUE : 4   

   


External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : * lam Boo

Link by name to the catalogue in VizieR :

AG+46 1040 AKARI-IRC-V1 J1416229+460519 BD+46 1949 FK5 527 GJ 3837
HD 125162 HIC 69732 HIP 69732 HR 5351 IRAS 14144+4619
IRAS F14144+4619 LSPM J1416+4605 2MASS J14162308+4605177 NLTT 36818 PLX 3246
PPM 54024 SAO 44965 TD1 17373 TYC 3472-1264-1 USNO-B1.0 1360-00237162
uvby98 100125162 WISEA J141622.78+460519.8 WISE J141622.59+460518.9 [DML87] 343 Gaia DR2 1505311442256006912

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2020.10.31-09:15:03

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