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1999A&A...347L..51C - Astronomy and Astrophysics, volume 347, L51-54 (1999/7-3)
Magnitude, color and spectral type of Aql X-1 in quiescence.
CHEVALIER C., ILOVAISKY S.A., LEISY P. and PATAT F.
Abstract (from CDS):
Direct I and V-band imaging of Aql X-1 in quiescence and during outburst maximum shows that the true optical counterpart is the interloper located 0.48" West of the previously known star. We find for the new counterpart V=21.6 and V-I=2.2 in quiescence, when its contribution to the total light was 12% in V and 22% in I. Analysis of this photometry and of low-resolution spectra of the sum of both stars, also taken during quiescence, shows that the likely spectral types for the previously known star and the optical counterpart are late G and late K, respectively, reddened by E(B-V)=0.5±0.1.
Abstract Copyright: ∼
Journal keyword(s): stars: binaries: close - stars: individual: Aql X-1 - stars: neutron - X-rays: stars
Nomenclature: Table 1: [CIL99] Star a (Nos a-e). Text: [CIL99] CN (Nos C1-C2).
Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.
Simbad objects: 10
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