BD+55 521 activity

[Paolo Berardi]

U. Sollecchia found a noticeable increase of h-alpha emission line on 21 december 2014 respect to the last spectrum in BeSS taken with Elodie spectrograph (14 jan 2003).



The mid-res observation (Lhires III 1200) seems to confirm.



Paolo

[Robin Leadbeater]

Hi Paolo,

Very interesting. I looked this star back in 2008 using the Star Analyser as part of some tests to find out if the SA100 could detect changes in activity in fainter stars
http://www.threehillsobservatory.co.uk/ ... tra_38.htm
I suspected then that the activity was higher than in 2003 but I did not have good enough equiment or experience then to confirm it with a high resolution spectrum

Tonight I was able to record it using the LHIRES 2400 and C11 and confirm your spectrum

Cheers
Robin

[Paolo Berardi]

Hi Robin, thank you for your observation! Moreover, your spectrum taken in 2008 shows without doubt that the increase of h-alpha strength was already in progress. Low resolving power spectrographs (included the Star Analyser) seem useful instruments to massively monitor faint Be stars status (to intercept large changes).

Paolo