CDS

2014A&A...572A.112M

Query : 2014A&A...572A.112M

2014A&A...572A.112M - Astronomy and Astrophysics, volume 572A, 112-112 (2014/12-1)

A non-LTE spectral analysis of the 3He and 4He isotopes in the HgMn star κ Cancri.

MAZA N.L., NIEVA M.-F. and PRZYBILLA N.

Abstract (from CDS):

We present a pilot study on non-local thermodynamic equilibrium (NLTE) line-formation computations for the isotopes 3He and 4He in the mercury-manganese star κ Cancri. The impact of NLTE effects on the determination of isotopic abundances and the vertical stratification of helium in the atmosphere is investigated. Modern NLTE line-formation computations were employed to analyse a high-resolution and high signal-to-noise ratio ESO-VLT/UVES spectrum of κ Cnc. The atmospheric parameters were determined from fitting the hydrogen Balmer lines and the spectral energy distribution. Multiple HeI lines were investigated, including HeI λ4921Å andλ6678 Å, which show the widest isotopic splits. Half of the observed HeI lines in the spectrum of κ Cnc show significant NLTE strengthening, the effects are strongest in the red lines HeI λ5875Å and HeI λ6678Å. NLTE abundances from individual HeI lines are up to a factor of ∼3 lower than LTE values. Helium is found to be stratified in the atmosphere of κ Cnc. While the LTE analysis indicates a step-like profile of the helium abundance, a gradual decrease with height is indicated by the NLTE analysis. A 3He/4He ratio of ∼0.25-0.30 is found. With the available data it cannot be decided whether the two isotopes follow the same stratification profile, or not. This work implies that NLTE effects may be ubiquitous in the atmospheres of HgMn stars and may have a significant impact on abundance determinations and the interpretation of the vertical abundance stratification of elements.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - stars: atmospheres - stars: chemically peculiar - stars: early-type - stars: individual: κ Cancri

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 - 2023 		#notes
1 * kap Cnc a2* 09 07 44.8095541176 +10 40 05.519586828 4.70 5.13 5.24     B8IIImnp 364 0

Query : 2014A&A...572A.112M

Basic data :
* kap Cnc -- alpha2 CVn Variable
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,...), SB* (SBC7,SBC9), ** (**,WDS), V* (CSV,V*), a2* (2003AstL), UV (TD1), NIR (2MASS), IR (IRAS)
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) : 		09 07 44.8095541176 +10 40 05.519586828 (Optical) [ 0.1124 0.0766 90 ] A 2020yCat.1350....0G
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) : 		09 05 02.3988900799 +10 52 14.239535757 [ 0.1124 0.0766 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) : 		218.9854717285280 +35.0619791923858 [ 0.1124 0.0766 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 : 		-18.312 -12.105 [0.143 0.127 90] A 2020yCat.1350....0G
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) 24.50 [0.8] / z(~) 0.000082 [0.000003] / cz 24.50 [0.80]
   A 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): 		5.3209 [0.1298] A 2020yCat.1350....0G
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: 		B8IIImnp C ~
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 (7) :
U 4.70 [~] C 2002yCat.2237....0D
B 5.13 [~] C 2002yCat.2237....0D
V 5.24 [~] C 2002yCat.2237....0D
G 5.189373 [0.002928] C 2020yCat.1350....0G
J 5.418 [0.029] C 2003yCat.2246....0C
H 5.444 [0.038] C 2003yCat.2246....0C
K 5.463 [0.023] C 2003yCat.2246....0C
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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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.
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The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (42) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* kap Cnc GSC 00815-02146 Renson 22170 UBV M 15099
* 76 Cnc HD 78316 ROT 1435 uvby98 100078316
** CHR 257 HIC 44798 SAO 98378 V* kap Cnc
AG+10 1179 HIP 44798 SBC7 368 WDS J09077+1040AB
ALS 16572 HR 3623 SBC9 554 WEB 8561
BD+11 1984 IRAS F09050+1052 SKY# 17602 YZ 10 3661
CSV 101015 2MASS J09074481+1040055 SRS 31238 [HFE83] 638
FK5 1238 N30 2159 TD1 13553 Gaia DR2 592021045155272832
GC 12596 PLX 2177.01 TIC 323658126 Gaia DR3 592021045155272832
GCRV 5976 PMC 90-93 844 TYC 815-2146-1
GEN# +1.00078316 PPM 126134 UBV 8769

References (364 between 1850 and 2023) (Total 364)
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


velocities : 10    distance : 2    ROT : 4    Fe_H : 19    PLX : 5    PM : 7    MK : 7   

   

Observing logs


IUE : 63   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : * kap Cnc

Link by name to the catalogue in VizieR :

AG+10 1179 ALS 16572 BD+11 1984 FK5 1238 GSC 00815-02146
HD 78316 HIC 44798 HIP 44798 HR 3623 IRAS F09050+1052
2MASS J09074481+1040055 PPM 126134 SAO 98378 TD1 13553 TYC 815-2146-1
uvby98 100078316 V* kap Cnc WDS J09077+1040AB Gaia DR2 592021045155272832 Gaia DR3 592021045155272832

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2023.09.21-18:50:23

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