Variable Stars South

BG Ind (HD208496)

Details: Last Updated on Saturday, 13 April 2013 06:09; Written by Mark Blackford

Related Project

Observing Notes

More data required

Aim of the campaign

BG Indi is an F3 detached eclipsing binary system. The initial aim is to determine accurate Time of Minimum for several primary and secondary eclipses. We will repeat TOM measurements each season in order to accurately determine the period and develop an O-C diagram.

Data

STAR	Max V Mag	RA 2000	Krakow epoch (HJD)	BRNO period	Primary / secondary
BG Ind	6.11	21h58m30.1s	2452500.6190	1.4640628	p
	Min V Mag	DEC 2000	Rozyczka et. al.*	*Rozyczka et. al. period**
	6.36	-59°00' 44"	2447876.3792	1.46406335

*Rozyczka et. al., Mon. Not. R. Astron. Soc. 414, 2479-2485 (2011)

Note: the eclipse of the more massive component is defined as the primary eclipse in this paper, despite it being the shallower eclipse. The deeper eclipse is defined as the primary eclipse in the BRNO database. Recent data: 2455783.05767 (0.00015) TOM for primary eclipse (M. Blackford)

Light Curve

From Van Hamme and Manfroid, Astron. Astrophys. Suppl. Ser. 74, 247-250 (1988)

Observing

No bright field stars close enough to interfere with measurements.

Finder Chart

The field of BG Ind is shown in the plot below.

Comparison Star Data

Please use the four comparison stars labled on the chart and catalogue values listed below.

Comp Star	Name	RA (J2000)	DEC (J2000)	V	B-V	V-Rc
1	HD207964	21 55 11.34	-61 53 11.0	5.913	0.387	0.187
2	HD208149	21 56 14.04	-57 53 58.6	6.169	0.213	0.042
3	HD207575	21 52 09.67	-62 03 07.7	7.226	0.489	0.258
4	HD210591	22 13 05.83	-59 41 30.1	7.709	0.204	0.000

Preliminary Results

The plot below shows a minimum observed by Mark Blackford at HJD 2455783.05767 (0.00015) as determined using PERANSO. This is 14min 12sec later than the Krakow primary eclipse prediction and 6min 15sec later than the Rozyczka et. al. secondary eclipse prediction.