||Abstrakt / poznámka
|0038||Four Previously Unreported Red Variables in ASAS |
|Martin Nicholson, Eric Whiting||2006-06-17|
| ||Four new variables with high southern declination. Based on the rationale outlined by Greaves (2005) the 2MASS survey was data-mined for entries that matched the following criteria: dec < 0.000 and j_m - k_m >1.2 and vr_m_opt - j_m >6 and j_m <6.00. A total of 4,128 stars matched these four criteria. The publically available ASAS light curves for four previously unreported variables are presented. |
Objekty Simbad: IRAS 12006-6558, IRAS 12229-6706, IRAS 12290-5553, GSC 09416-00679,
Christopher Watson napsal dne 2006-06-18:
Object No. 1 is already known. ASAS-3 identifies the incorrect star of a ~13" pair as the variable. In actuality, the ASAS-3 position is 4" away from one star, and about 13.5" away from the other, so we can probably assume that the authors had assumed the ASAS-3 object wasn't related to their find (the 13.5" star), because it was
nearer the other star (the 4" one). Supporting this is that the ASAS-3 data appears to be for both, like a Mira overlaid with a constant star. So it is previously reported, and this then becomes a correction to that, not a discovery.
Stan Walker napsal dne 2006-07-08:
Watson's comment is a bit harsh. One survey showed that there may be 15-20 million variable stars brighter than 14, e.g., one every ~20", so I think the conclusions here are valid. Also, ASAS, for all its value, is rather careless in identifying new variables. They should either do better - or not make any identifications.
Arne Henden napsal dne 2006-07-10:
Commenting on Stan's comment: 15-20 million
variables brighter than 14th? I seem to
recall that GSC 1.2 has 15 million stars total,
and is considered complete to V=14.5 or so.
Can you give a reference? The number that I
have heard quoted from variable star surveys
is that less than one percent of stars are
easily identified as variable
(example: Henden & Stone 1998, AJ 115, 296).
Wolfgang Renz napsal dne 2007-03-30:
Where are the mags ranges and (if possible by the data) a preliminary period anylysis ?
Always thought that these data belong to the basic data set of every variable.
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