1997A&A...326L...5S

Query : 1997A&A...326L...5S

1997A&A...326L...5S - Astronomy and Astrophysics, volume 326L5-8 (1997/10-1)

The rotation speed of the companion star in Aquila X-1.

SHAHBAZ T., CASARES J. and CHARLES P.A.

Abstract (from CDS):

We have obtained medium resolution spectra of the neutron star X-ray transient Aql X-1 during quiescence. We determine the spectral type of the companion star to be K1 and also estimate its rotation speed to be 62+30–20km/s. By measuring the width of the Hα emission line profile of the accretion disc, we estimate the binary inclination to ∼50° and also estimate the semi-amplitude of the companion star's radial velocity curve to be ∼170km/s.

Abstract Copyright: ∼

Journal keyword(s): binaries: general - stars: fundamental parameters, stars: individual: Aql X-1 - stars: neutron

Simbad objects: 9

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Number of rows : 9
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 * iot Eri PM* 02 40 40.0348498136 -39 51 19.355490088   5.114 4.116     K0IIIb 100 0
2 HD 16975 * 02 42 06.6072699192 -38 23 01.273215804   6.909 5.988     G8III 44 0
3 HD 17006 PM* 02 42 08.4437861136 -46 31 27.989231952   6.985 6.094     K1III 60 0
4 HD 17325 * 02 45 16.6768919328 -46 17 13.133016996   8.179 6.821     K2III 17 0
5 * nu. Hyi * 02 50 28.4595952008 -75 04 01.013735064   6.080 4.742     K3III 59 0
6 * eta03 For PM* 02 50 40.4067847728 -35 40 33.059880156   6.741 5.472     K2III 31 0
7 HD 18265 * 02 54 06.4698521064 -50 52 17.046037452   7.770 6.198     K4III 20 0
8 V* V822 Cen LXB 14 58 21.9347842080 -31 40 07.515432768 11.95 12.85 12.8     K3-K7V 555 0
9 X Aql X-1 LXB 19 11 16.0571313336 +00 35 05.868232692           ~ 1186 1

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