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| Query : 1999A&A...347L..51C |
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
| Number of rows : 10 |
| N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2024 |
#notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | HD 87521 | PM* | 10 04 33.9745906248 | -39 19 00.723392652 | 10.17 | 9.14 | K3V | 43 | 0 | |||
| 2 | CD-36 6589 | ** | 10 41 09.3043484838 | -36 53 43.665750147 | 12.608 | 11.413 | 9.992 | 9.841 | 7.979 | M0.5 | 44 | 0 |
| 3 | HD 164500 | PM* | 18 03 41.4466680264 | -45 51 43.442232660 | 10.42 | 9.62 | G8V | 34 | 0 | |||
| 4 | HD 168402 | PM* | 18 21 11.4634695936 | -38 40 56.039096424 | 9.97 | 9.30 | G3V | 17 | 0 | |||
| 5 | HD 171982 | PM* | 18 39 19.6730763528 | -37 42 08.083644732 | 9.30 | 8.40 | K0V | 31 | 0 | |||
| 6 | HD 172582 | PM* | 18 43 40.5554083008 | -50 09 54.043284420 | 9.98 | 9.27 | G6V | 39 | 0 | |||
| 7 | HD 178445 | SB* | 19 10 52.2681353722 | -47 09 31.038072337 | 11.972 | 10.672 | 9.342 | 8.526 | 7.809 | K6.5V | 60 | 1 |
| 8 | [CIL99] Star e | * | 19 11 16.05 | +00 35 05.8 | ~ | 2 | 1 | |||||
| 9 | X Aql X-1 | LXB | 19 11 16.0571313336 | +00 35 05.868232692 | ~ | 1136 | 1 | |||||
| 10 | [CIL99] Star a | * | 19 11 16.08 | +00 35 05.9 | ~ | 3 | 1 |
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