2005A&A...441..663K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST00:23:23

2005A&A...441..663K - Astronomy and Astrophysics, volume 441, 663-674 (2005/10-2)

Orbital and spin variability of the intermediate polar BG CMi.

KIM Y.G., ANDRONOV I.L., PARK S.S. and JEON Y.-B.

Abstract (from CDS):

Result. of a CCD study of the variability of the cataclysmic variable BG CMi obtained at the Korean 1.8 m telescope in 2002-2005 are presented. The ``multi-comparison star'' method had been applied for better accuracy estimates. The linear ephemeris based on 19 mean maxima for 2002-2005 is HJD 2453105.31448(6)+0.01057257716(198)(E-764707). The period differs from that predicted by the quadratic ephemeris by Pych et al. (1996AcA....46..279P) leading to a possible cycle miscount. The statistically optimal ephemeris is a fourth-order polynomial, as a quadratic or even a cubic ephemeris leads to unaceptably large residuals: Min.HJD=2445020.28095(28)+0.0105729609(57)E-1.58(32)x10–13E2-5.81(64)x10–19E3+4.92(41)x10–25E4. Thus the rate of the spin-up of the white dwarf is decreasing. An alternative explanation is that the spin-up has been stopped during recent years. The deviations between the amplitudes of the spin variability in V and R, as well as between phases are not statistically significant. However, the orbital light curves exhibit distinct difference; the corresponding color index shows a nearly sinusoidal shape with a maximum at orbital phase ∼0.2. The variations of the amplitude of spin waves shows a short maximum at the phase of the orbital dip. The corrected ephemeris for orbital minima is Min.HJD=2448368.7225(12)+0.13474841(6)x(E-24849) with a narrow dip occuring 0.07P later. The rate of the spin period variation seems to be changed, justifying the necessity of regular observations of intermediate polars.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: individual: BG CMi - stars: individual: FO Aqr - stars: binaries: close - stars: novae, cataclysmic variables - stars: variables: general cataclysmic

CDS comments: Paragraph 2.1 Main comparison star 05 is [HH95] BG CMi- 5 in Simbad

Simbad objects: 10

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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 - 2020
#notes
1 V* TT Ari No* 02 06 53.0797667881 +15 17 41.849759579   10.73 10.20     Bep: 418 0
2 V* UV Aur C* 05 21 48.9137852435 +32 30 40.177257425   12.46 10.41 9.15   C8,1Je 197 0
3 HD 34842 ** 05 21 48.92 +32 30 39.8           C8,1Je+B9V 197 0
4 V* BG CMi DQ* 07 31 29.0080158732 +09 56 23.029183793   14.5       ~ 205 0
5 [HH95] BG CMi-5 * 07 31 29.1170465975 +09 56 39.018096087   13.164 12.457     ~ 3 0
6 V* DW UMa CV* 10 33 52.8751166936 +58 46 54.719916520   14.33   14.33 14.35 ~ 214 0
7 V* AM Her AM* 18 16 13.2546541781 +49 52 04.759861155     12.30     M4.5 911 0
8 V* MV Lyr No* 19 07 16.2886975947 +44 01 07.867270712   12.18 12.843   12.578 M5Ve 249 0
9 V* V1329 Cyg Sy* 20 51 01.2322054447 +35 34 54.111427235           M4IIIe 294 2
10 V* FO Aqr DQ* 22 17 55.3796324299 -08 21 03.755362145           ~ 323 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-00:23:23

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