In einer eMail vom 05.06.2007 04:39:47 Westeuropäische Normalzeit schreibt
Thom Gandet:
Hi Ernst,
Thank you for your e-mails about P Cyg and Gamma Cas.
I told Arne Hended at AAVSO about the P Cyg results you
sent out. He kindly e-mailed an AAVSO Special Alert
on P Cyg.
I forwarded your gamma Cas to him today.
I think you guys are doing fantastic work!
Has your group been observing Delta Sco?
Cheers,
Thom Gandet
Hallo Liste,
einige aktuelle Ergebnisse aus Gemeinschaftbeobachtungen unserer Gruppe zu
gCas und PCyg hatte ich
in der Be-Star-Mailingliste bekanntgegeben.
Erfreulich und ermunternd ist das statement vom Profi Th. G. aus Südafrika
(oben).
------ Start of attached email. Subject: Re: gamma Cas ------
Hi Ernst,
Thank you for your e-mails about P Cyg and Gamma Cas.
I told Arne Hended at AAVSO about the P Cyg results you
sent out. He kindly e-mailed an AAVSO Special Alert
on P Cyg. Here is what he wrote:
"P Cyg (2014+37A) is the prototype of massive stars with
high mass outflow; it is characterized by blue-shifted
emission lines along with red-shifted absorption lines.
Surprisingly, we've never created a Variable Star
of the Season article for this neat star - I'll have
to make sure that happens soon.
"Located at 20:17:47.20 +38:01:58.5 J2000
it is typically around V=4.8 (though its
outburst in AD1600 reached 3rd magnitude), and is the
nearest of the Luminous Blue Variable (or S Dor) class,
currently thought to be the progenitors to some types of
supernovae. eta Car is another example.
"P Cyg also has a weakly visible surrounding nebulae
of about 3arcmin diameter, and an inner nebulae about
20arcsec diameter.
"Lamers and de Groot (1992, A&A 257, 153)
also indicate that P Cyg has been slowly increasing in
mean brightness over the past few centuries, at a rate
of about 0.15mag per century. Recently, P Cyg has also
been showing increased H-alpha activity, as observed by
Ernst Pollman, a German spectroscopist.
"Since P Cyg is an ideal target for the AAVSO PEP observers,
I would like to ask them to give P Cyg high priority in their
monitoring activity over the current season. You can find the
PEP chart on the web page, including the suggested comparison
and check star. There are no nearby comp stars for CCD observers,
but those with wide-field systems could also give this a
try. This remains an interesting target for visual
observers as well; the increased activity could be a
precursor for an outburst.
Arne"
I forwarded your gamma Cas to him today.
I think you guys are doing fantastic work!
Has your group been observing Delta Sco?
Cheers,
Thom Gandet
----- Original Message -----
From: "Ernst Pollmann"
To: <BE-STARS@...>
Sent: Monday, June 04, 2007 11:45 AM
Subject: gamma Cas
What happens in gamma Cas since one year?
Since June 2006 more or less constantly increase of its Halpha EW of 10
Angströms (see attachment).
The plot represent amateur measurements of the spectroscopy group of the
German Amateur Astronomers Society (VdS).
Ernst Pollmann
Emil-Nolde-Str. 12
51375 Leverkusen
Phone: 0049-214-91829
http://spektroskopie.fg-vds.de/pollmann
------ End of attached email ------
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