2008AJ....136..890D

Query : 2008AJ....136..890D

2008AJ....136..890D - Astron. J., 136, 890-894 (2008/August-0)

Refining the parallax in visual double stars using orbital and spectral data: application to the system of the K0 giants, A 1808.

DOCOBO J.A., TAMAZIAN V.S., ANDRADE M., MELIKIAN N.D. and KARAPETIAN A.A.

Abstract (from CDS):

In this paper, we show how Hipparcos parallaxes of distant visual binaries (πHip≲ 10 mas) can be refined. This is accomplished by using relevant orbital and spectral data. To this end, we study the pair of K0 giants, A 1808. A revised orbit of this system is presented that was calculated by taking into account a set of interferometric and visual measurements covering almost one orbital revolution. In addition, by analyzing its spectrum obtained with the 2.6 m telescope of the Byurakan Astrophysical Observatory (Armenia), we confirm the MK spectral type, K0III. On the basis of B - V photometric data, we derived the extinction AV= 0.23±0.08 mag as well as obtained a spectroscopic parallax (πsp= 3.19±0.21 mas) with a much smaller relative uncertainty of 6.6% compared with that of Hipparcos (42.1%; πHip = 2.43±1.00 mas). Accordingly, this system is now placed at 313±21 pc. With the obtained spectroscopic parallax, a dynamical mass of is obtained, which agrees well with that expected from standard calibrations.

Abstract Copyright: ∼

Journal keyword(s): astrometry - binaries: visual - stars: individual: A 1808

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 HD 4934 ** 00 51 36.9927570 +22 37 24.396901   8.19 7.13     K0III 51 0

Query : 2008AJ....136..890D

Basic data :
HD 4934 -- Double or Multiple Star
Other object types: otypes_help 		* (AG,BD,...), ** (2002A&A,CCDM,...), NIR (2MASS), IR (IRAS)
ICRS coord. (ep=J2000) : 		00 51 36.9927570 +22 37 24.396901 (Optical) [ 0.74 0.63 90 ] A 2007A&A...474..653V
FK4 coord. (ep=B1950 eq=1950) : 		00 48 57.1750932 +22 21 06.127367 [ 0.74 0.63 90 ]
Gal coord. (ep=J2000) : 		122.9859339652 -40.2482852685 [ 0.74 0.63 90 ]
Proper motions mas/yr : 		10.95 2.88 [1.00 0.64 0] A 2007A&A...474..653V
Radial velocity / Redshift / cz : 		V(km/s) 14.03 [0.21] / z(~) 0.000047 [0.000001] / cz 14.03 [0.21]
   A 2005A&A...430..165F
Parallaxes (mas): 		3.93 [0.86] A 2007A&A...474..653V
Spectral type: 		K0III C ~
Angular size (arcmin): 		0.0033 0.0 200 (Opt) D 2001AJ....122.3466M
Fluxes (6) :
B 8.19 [0.02] D 2000A&A...355L..27H
V 7.13 [0.01] D 2000A&A...355L..27H
G 6.8672 [0.0005] C 2018yCat.1345....0G
J 5.323 [0.024] C 2003yCat.2246....0C
H 4.859 [0.016] C 2003yCat.2246....0C
K 4.741 [0.018] C 2003yCat.2246....0C
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Identifiers (20) :
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CCDM J00516+2237AB GC 1028 IDS 00463+2205 AB TIC 435876203
** A 1808 GSC 01739-00186 IRAS 00489+2221 TYC 1739-186-1
ADS 701 AB HD 4934 2MASS J00513699+2237243 WDS J00516+2237AB
AG+22 90 HIC 4030 PPM 90227 YZ 22 262
BD+21 111 HIP 4030 SAO 74322 Gaia DR2 2802279419757750144

References (51 between 1850 and 2026) (Total 51)
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 : 1    Plx : 2    PM : 4    SpT : 2   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : HD 4934

Link by name to the catalogue in VizieR :

CCDM J00516+2237AB AG+22 90 BD+21 111 GSC 01739-00186 HD 4934
HIC 4030 HIP 4030 IRAS 00489+2221 2MASS J00513699+2237243 PPM 90227
SAO 74322 TYC 1739-186-1 WDS J00516+2237AB Gaia DR2 2802279419757750144

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