2021RNAAS...5..284M

Query : 2021RNAAS...5..284M

2021RNAAS...5..284M - Research Notes of the AAS, 5, 284 (2021/December-0)

The Distribution of Iron over the Surface of 21 Com.

MONIER R.

Abstract (from CDS):

Comparison of high dispersion LWP spectra obtained in 24 hr of monitoring of 21 Com with IUE in April 1991 reveals variations of low excitation Fe II lines at phase 0.65 of the rotational period (FUV minimum flux) compared to phase 0.18 (FUV maximum flux). All 10 Fe II lines of UV Multiplets 1 and 62 are consistently stronger at phase 0.65, which shows that the FUV flux minimum can be partially explained to an increase of the disk averaged iron abundance. In contrast, comparison of optical high resolution high signal-to-noise ELODIE spectra of 21 Com taken in 2004 April and separated by about half of the 2 days rotational period, reveals no significant variations of the Fe II and Fe I lines. The lines monitored in the mid UV are strong low-lying transitions which are probably more sensitive to small abundance gradients over the surface of 21 Com.

Abstract Copyright: © 2021. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Chemical abundances - Chemically peculiar 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 * 21 Com a2* 12 31 00.5605002264 +24 34 01.797245328   5.496 5.436     A2pv 295 0

Query : 2021RNAAS...5..284M

Basic data :
* 21 Com -- alpha2 CVn Variable
Other object types: otypes_help 		* (2022ApJS,*,...), UV (FAUST,TD1), a2* (2017ARep), dS* (2017ARep), SB* (SBC9), V* (V*), NIR (2MASS)
ICRS coord. (ep=J2000) : 		12 31 00.5605002264 +24 34 01.797245328 (Optical) [ 0.0816 0.1026 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		12 28 30.8290680867 +24 50 35.897922561 [ 0.0816 0.1026 90 ]
Gal coord. (ep=J2000) : 		240.9269094580673 +84.7392398204867 [ 0.0816 0.1026 90 ]
Proper motions mas/yr : 		-12.474 -9.085 [0.082 0.128 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 0.1 [0.9] / z(~) 0.000000 [0.000003] / cz 0.10 [0.90]
   A 1979IAUS...30...57E
Parallaxes (mas): 		12.0785 [0.1214] A 2020yCat.1350....0G
Spectral type: 		A2pv C ~
Fluxes (6) :
B 5.496 [0.014] D 2000A&A...355L..27H
V 5.436 [0.009] D 2000A&A...355L..27H
G 5.430502 [0.002899] C 2020yCat.1350....0G
J 5.293 [0.037] C 2003yCat.2246....0C
H 5.308 [0.027] C 2003yCat.2246....0C
K 5.269 [0.017] C 2003yCat.2246....0C
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1 : 536 Display criteria :

Identifiers (39) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* 21 Com GCRV 7530 PPM 101953 UBV M 41719
AG+24 1312 GEN# +5.21110160 Renson 31610 uvby98 521110160
BD+25 2517 GSC 01989-03213 ROT 3940 V* UU Com
Cl* Melotte 111 AV 1973 HD 108945 SAO 82346 WEB 10871
Cl* Melotte 111 BOU 35 HGAM 617 SBC9 1927 YPAC 514
Cl Melotte 111 160 HIC 61071 SKY# 23400 YZ 24 6145
Cl Melotte 111 1604 HIP 61071 TD1 16320 [SS59] I 294
FAUST 3194 HR 4766 TIC 393819751 Gaia DR2 3959965486205062528
FAUST NGP-2 JP11 5077 TYC 1989-3213-1 Gaia DR3 3959965486205062528
GC 17056 2MASS J12310056+2434018 UBV 11245

References (295 between 1850 and 2026) (Total 295)
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 : 10    Diameter : 1    Distance : 4    Rot : 7    Fe/H : 5    Plx : 5    PM : 4    SpT : 10   

   

Observing logs
IUE : 99   

   

External archives :

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

Link by name to the catalogue in VizieR :

AG+24 1312 BD+25 2517 FAUST 3194 FAUST NGP-2 GSC 01989-03213
HD 108945 HIC 61071 HIP 61071 HR 4766 2MASS J12310056+2434018
PPM 101953 SAO 82346 TD1 16320 TYC 1989-3213-1 uvby98 521110160
V* UU Com Gaia DR2 3959965486205062528 Gaia DR3 3959965486205062528

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