2019PASP..131f4202Z

Query : 2019PASP..131f4202Z

2019PASP..131f4202Z - Publ. Astron. Soc. Pac., 131, part no 6, 4202-64202 (2019/June-0)

Pulsations of the SX Phe star BL Camelopardalis.

ZONG P., ESAMDIN A., FU J.N., NIU H.B., FENG G.J., YANG T.Z., BAI C.-H., ZHANG Y. and LIU J.Z.

Abstract (from CDS):

We carried out photometric observations of the SX Phe star BL Cam in 2014, 2017, and 2018 using Nanshan 1-m telescope. In addition to the dominated frequency of 25.5790 (3) cd^–1 and its two harmonics, an independent frequency of 25.247 (2) cd^–1, which is a nonradial mode frequency, was detected from the data in 2014. A total of 123 new times of light maxima were determined from our light curves in the three years, which, together with that published in the literature, were used to analyze the O-C diagram. The change rate of the main period was derived as (1/P)(dP/dt) = -2.39 (8) x 10^–8 yr^–1, which is lower than that published in previous literature. A periodical change with a period of 14.01 (9) yr was found in the residuals of the O-C curve fitting. If it was caused by the light-time effect, BL Cam should be a binary system. The mass of the companion was restricted as low as that of a brown dwarf. No evidence of the triple system suggested by previous authors was shown in our analysis.

Journal keyword(s):

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	GD 428	SX*	03 47 19.8773016336	+63 22 42.150015336		13.10		13.26		~	104	0

Query : 2019PASP..131f4202Z

Basic data :

GD 428 -- SX Phe Variable

* (GSC,GD,...), SX* (2003AstL), dS* (2009AJ), PM* (2018yCat), V* (V*), NIR (2MASS)

03 47 19.8773016336 +63 22 42.150015336 (Optical) [ 0.0148 0.0145 90 ] A 2020yCat.1350....0G

03 42 54.7308424764 +63 13 27.369693970 [ 0.0148 0.0145 90 ]

141.1969666922579 +06.9290861966413 [ 0.0148 0.0145 90 ]

123.531 -28.887 [0.015 0.020 90] A 2020yCat.1350....0G

1.4725 [0.0203] A 2020yCat.1350....0G

B 13.10 [~] E ~

R 13.26 [0.12] E 2009yCat.1315....0Z

G 13.015898 [0.004944] C 2020yCat.1350....0G

J 12.196 [0.038] C 2003yCat.2246....0C

H 12.026 [0.039] C 2003yCat.2246....0C

K 11.987 [0.034] C 2003yCat.2246....0C

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`GSC 04067-00471`	`NSVS 2046352`	*`V BL Cam`**
`GD 428`	`TIC 392774261`	`Gaia DR2 487276688415703040`
`2MASS J03471987+6322422`	`UCAC3 307-64627`	`Gaia DR3 487276688415703040`

References (104 between 1850 and 2026) (Total 104)
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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`GSC 04067-00471`	`2MASS J03471987+6322422`	`UCAC3 307-64627`	*`V BL Cam`**	`Gaia DR2 487276688415703040`
`Gaia DR3 487276688415703040`

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