NDLI: Variability and possible rapid evolution of the hot post-AGB stars Hen 3-1347, Hen 3-1428, and LSS 4634

Content Provider	Springer Nature Link
Author	Arkhipova, V. P. Burlak, M. A. Esipov, V. F. Ikonnikova, N. P. Kniazev, A. Yu. Komissarova, G. V. Tekola, A.
Copyright Year	2014
Abstract	We present the results of spectroscopic and photometric observations for three hot southern-hemisphere post-AGB objects, Hen 3-1347 = IRAS 17074-1845, Hen 3-1428 = IRAS 17311-4924, and LSS 4634 = IRAS 18023-3409. In the spectrograms taken with the 1.9-m telescope of the South African Astronomical Observatory (SAAO) in 2012, we have measured the equivalent widths of the most prominent spectral lines. Comparison of the new data with those published previously points to a change in the spectra of Hen 3-1428 and LSS 4634 in the last 20 years. Based on ASAS data, we have detected rapid photometric variability in all three stars with an amplitude up to 0 · m 3-0 · m 4 in the V band. A similarity between the patterns of variability for the sample stars and other hot protoplanetary nebulae is pointed out. We present the results of UBV observations for Hen 3-1347, according to which the star undergoes rapid irregular brightness variations with maximum amplitudes ΔV = 0 · m 25, ΔB = 0 · m 25, and ΔU = 0 · m 30 and shows color-magnitude correlations. Based on archival data, we have traced the photometric history of the stars over more than 100 years. Hen 3-1347 and LSS 4634 have exhibited a significant fading on a long time scale. The revealed brightness and spectrum variations in the stars, along with evidence for their enhanced mass, may be indicative of their rapid post-AGB evolution.
Starting Page	485
Ending Page	498
Page Count	14
File Format	PDF
ISSN	10637737
Journal	Astronomy Letters
Volume Number	40
Issue Number	8
e-ISSN	15626873
Language	English
Publisher	Pleiades Publishing
Publisher Date	2014-08-14
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	post-AGB stars planetary nebulae photometric and spectroscopic observations photometric variability Astronomy, Observations and Techniques Astrophysics and Astroparticles
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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