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----- Original Message ----- From: "Mati Morel" <morel@ozemail.com.au> To: "Sebastian Otero" <varsao@fullzero.com.ar> Sent: Friday, May 09, 2003 2:08 AM Subject: Re: [vsnet-chat 6312] RS Oph > I am a little puzzled about Sebastian's comments about the sequence for RS > Oph. Maybe he got his hands on a very old chart. My comments below. > > > Regarding another symbiotic, the recurrent nova RS Oph, I wonder if > > there is any PEP sequence of its field . . . > Yes! In 1981 Ronald Webbink compiled a list of 176 stars with UBV data > in the field of RS Oph. This list includes naked stars and other stars down > to 13.75V. It includes all stars which have ever been used for comparison > purposes. Tables of corrigenda are included, for three important sequences > used in the past. > > Webbink's list was published in its entirety as part of Series 13 of > _Charts for Southern Variables_, 1981 (F. Bateson, M. Morel, B. Sumner and > R. Winnett, Astronomical Research Ltd, Tauranga, New Zealand). The V > magnitudes were used on charts 593 and 594 of the same series. > Webbink's sequence was used by the AAVSO to update their charts for RS > Oph, in the early 1980s. > Good photoelectric V sequence mags. have been in use for more than 20 > years. > I point this out with the greatest respect to Sebastian. Mati, Every correction to one's mistakes is always welcome, so, thanks! It's just that when I don't see magnitudes placed to 2 decimal places and colors, I instinctively assume it is not a PEP sequence. I didn't see it was written in the AAVSO chart! I feel more comfortable that the magnitudes I have been reporting are not too off, since I used mostly AAVSO chart magnitudes because I felt Tycho-2 was wrong. The problem is that all these sequences are not online so it is difficutl to use the original data. In this case we had a sequence but unfortunately, this is one of a few so ASAS-3 will be a great help. Regards, Sebastian. PS: Although most of ASAS-3 magnitudes agree with that of Webbink's sequence, there are a couple of red stars that don't:: the 113SE and 117 comp. stars. They are given as brighter both in Tycho-2 and ASAS-3. From ASAS-3 data they don;t seem to be variable.
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