V716 Centaurus (HD124195)

Aim of the campaign

V716 Centaurus is an early-type semidetached binary system which has been very poorly observed. 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.

{tab Data}

STAR	Max V Mag	RA 2000	BRNO epoch (HJD)	BRNO period	Primary / secondary
V716 Cen	5.96	14h13m39.8s	2438524.4069	1.490096	p

	Min V Mag	DEC 2000	Krakow epoch (HJD)	Krakow period
	6.52	-54°37′ 32″	2452501.4920	1.4900943

Recent data: 2455746.91026 (0.00012) TOM for primary eclipse (M. Blackford)

{tab Light Curve}

From Bakis, H., Bakis, V., Demerican, O. And Eker, Z., Mon. Not. R. Astron. Soc. 385, 381-390 (2008).

{tab Observing}

No bright field stars close enough to interfere with measurements.

{tab Finder Chart}

The field of V716 Cen is shown in the plot below.

{tab 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	HD121336	13 56 19.95	-54 07 56.7	6.150	0.060	-0.073
2	HD124812	14 17 25.52	-55 45 54.5	6.625	0.188	0.144
3	HD125287	14 20 14.23	-55 47 29.0	7.086	0.938	0.452
4	HD125669	14 22 43.21	-55 25 52.1	7.216	0.070	-0.050

{tab Preliminary Results}

The plot below shows a primary minimum observed by Mark Blackford at HJD 2455746.91026 (0.00012) as determined using PERANSO which is roughly 38 minutes earlier than the BRNO prediction and 10 minutes earlier than the Krakow prediction.

{/tabs}