[vsnet-const 3] V449 Sco

[Sebasti$B]

This new list gives me the chance of sharing comments about some strange cases.

V449 Sco is one of them.

The star is classified as CST in the latest GCVS witha 7.1 photographic magnitude. Given its color index it should be 7.0V as it is indeed.

But in previous GCVS editions (1969-70) the star was presented as an uncertain type and with the range 7.0 - 7.6 p.

Visual observations were carried on by observers in the Subcomisi de Estrellas Variables of the AAAA (Asociaci Argentina Amigos de la Astronom$ByB(B) during 1971 and 1972. They found the star to be probably of the EB type with an amplitude of 0.7 v mag. in primary minimum and 0.4 in the secondary one. The following elements were deduced:

 

Epoch:  2441503.85  -  Period:   13.7 days.  - Range:  6.6 - 7.3 v

 

This was an interesting and rather overlooked variable so I included it in my observing program in 1998.

But the only thing I could do was to make a confirmation of its non-variability:

 

SCOV449    19980228.2868   70   OSE

SCOV449    19980301.2409   70   OSE

SCOV449    19980331.2090   70   OSE

SCOV449    19980409.1770   70   OSE

SCOV449    19980420.1701   70   OSE

SCOV449    19980428.2152   70   OSE

SCOV449    19980501.2013   70   OSE

SCOV449    19980505.1722   70   OSE

SCOV449    19980720.0215   70   OSE

SCOV449    19980813.1458   70   OSE

 

Furthermore the Tycho Catalogue gives a 7.03V value tht agrees perfectly with observation and with the 7.0 also derived from the GCVS photographic magnitude.

Could this previous-decades variability have stopped or should it be considerd just observational scatter?

Which is the source of that 7.6 p magnitude?

 

Best regards,

Sebasti$BaO(B Otero. 

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