2000A&A...364..660H

Query : 2000A&A...364..660H

2000A&A...364..660H - Astronomy and Astrophysics, volume 364660-664 (2000/12-2)

The distribution of calcium on the surface of ε Ursae Majoris: an abundance distribution Doppler image.

HOLMGREN D.E. and RICE J.B.

Abstract (from CDS):

We present a surface abundance Doppler image of singly-ionized calcium for the Bp star ε UMa based on high signal-to-noise CCD spectra. This map shows striking similarities to that of oxygen (Rice et al., 1997A&A...326..988R) and perhaps iron (Rice & Wehlau, 1990A&A...233..503R). The Ca II 866.2nm line has allowed us to obtain a detailed surface abundance map of calcium for ε UMa. The calcium abundance map has been used to locate the position of the positive magnetic pole on ε UMa at a longitude of 350.8 deg and a latitude of 25.8 deg. Calcium is distributed in a ring along the magnetic equator, along which the abundance is [Ca/H]=-5, which is close to a normal population I value. This represents an enhancement with respect to other regions by a factor of ∼103. A secondary feature is present with [Ca/H]=-6.5. A chemically differentiated stellar wind is proposed as the main mechanism for generating the surface abundance distribution of calcium.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - stars: chemically peculiar - stars: individual: ε UMa

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 * eps UMa a2* 12 54 01.7495922 +55 57 35.362645 1.76 1.75 1.77 1.79 1.82 A1III-IVpkB9 488 0

Query : 2000A&A...364..660H

Basic data :
* eps UMa -- alpha2 CVn Variable
Other object types: otypes_help 		a2* (), * (*,AG,...), ** (**,CCDM,...), V* (CSV,V*,...), IR (IRAS,IRC,...), UV (CEL,TD1), PM* (2018yCat), NIR (2MASS)
ICRS coord. (ep=J2000) : 		12 54 01.7495922 +55 57 35.362645 (Optical) [ 0.16 0.15 90 ] A 2007A&A...474..653V
FK4 coord. (ep=B1950 eq=1950) : 		12 51 50.0763429 +56 13 51.124734 [ 0.16 0.15 90 ]
Gal coord. (ep=J2000) : 		122.1800376477 +61.1646463243 [ 0.16 0.15 90 ]
Proper motions mas/yr : 		111.91 -8.24 [0.23 0.19 90] A 2007A&A...474..653V
Radial velocity / Redshift / cz : 		V(km/s) -12.70 [0.2] / z(~) -0.000042 [0.000001] / cz -12.70 [0.20]
   A 2006AstL...32..759G
Parallaxes (mas): 		39.51 [0.20] A 2007A&A...474..653V
Spectral type: 		A1III-IVpkB9 C 2003AJ....126.2048G
Fluxes (9) :
U 1.76 [~] C 2002yCat.2237....0D
B 1.75 [~] C 2002yCat.2237....0D
V 1.77 [~] C 2002yCat.2237....0D
R 1.79 [~] C 2002yCat.2237....0D
G 1.731607 [0.017023] C 2022yCat.1355....0G
I 1.82 [~] C 2002yCat.2237....0D
J 1.713 [0.246] D 2003yCat.2246....0C
H 1.698 [0.186] D 2003yCat.2246....0C
K 1.625 [0.266] D 2003yCat.2246....0C
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Identifiers (46) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* eps UMa GEN# +1.00112185 NAME Alioth TYC 3845-1190-1
* 77 UMa GSC 03845-01190 PLX 2964 UBV 11641
** BLM 2 HD 112185 PLX 2964.00 UBV M 18813
AG+56 909 HGAM 620 PMC 90-93 342 uvby98 100112185
BD+56 1627 HIC 62956 PPM 33769 V* eps UMa
CCDM J12540+5558AB HIP 62956 RAFGL 1584 WDS J12540+5558AB
CEL 4168 HR 4905 Renson 32580 WEB 11163
CNS5 3183 IRAS 12518+5613 ROT 1909 [HFE83] 911
CSV 101344 IRC +60222 SAO 28553 AAVSO 1249+56
FK5 483 JP11 2330 SKY# 23986 Gaia DR3 1576683529448755328
GC 17518 2MASS J12540170+5557349 TD1 16542
GCRV 7722 N30 2976 TIC 150387644

References (488 between 1850 and 2026) (Total 488)
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

Velocities : 13    Diameter : 1    Rot : 6    Fe/H : 8    Plx : 3    PM : 5    SpT : 20   

   

Observing logs
ISO : 4    IUE : 14   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : * eps UMa

Link by name to the catalogue in VizieR :

AG+56 909 BD+56 1627 CCDM J12540+5558AB CEL 4168 FK5 483
GSC 03845-01190 HD 112185 HIC 62956 HIP 62956 HR 4905
IRAS 12518+5613 IRC +60222 2MASS J12540170+5557349 PLX 2964 PPM 33769
RAFGL 1584 SAO 28553 TD1 16542 TYC 3845-1190-1 uvby98 100112185
V* eps UMa WDS J12540+5558AB Gaia DR3 1576683529448755328

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