2001A&A...376..978K


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.20CEST10:13:41

2001A&A...376..978K - Astronomy and Astrophysics, volume 376, 978-981 (2001/9-4)

Th4-4: A Be star which has turned into a planetary nebula within 30 years.

KONDRATYEVA L.N.

Abstract (from CDS):

The first optical spectra of Th4-4, obtained by the author in 1970, showed strong continuum and broad HI emission lines. In other words, at this time the object looked like a Be star. Some years later, [OIII] emission lines appeared in the spectrum indicating the existence of a gaseous envelope. Today the optical spectrum of Th4-4 is quite similar to that of a moderate excitation planetary nebula. The magnitude of the object has dropped from V=14.4mag to 16.6mag , and the effective temperature of the central star has increased from 22000K up to 40000K within the last 30 years.

Abstract Copyright:

Journal keyword(s): planetary nebulae: general: early type stars - stars: emission lines, Be stars: individual: Th4-4 - stars: evolution

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * zet Cas Pu* 00 36 58.2841866 +53 53 48.867311 2.58 3.47 3.66 3.74 3.95 B2IV 421 0
2 * 62 Tau * 04 23 59.7629429746 +24 18 03.527426906 6.18 6.499 6.337     B 191 0
3 * zet Tau Be* 05 37 38.6854231 +21 08 33.158804 2.22 2.84 3.03 3.06 3.15 B1IVe_shell 697 0
4 V* RT Ser No* 17 39 51.9830954180 -11 56 38.823655557     10.60     A8 123 0
5 PN Th 4-4 Sy* 17 50 23.8222415739 -19 53 43.187731493   17.5   15.63 13.21 M4/6e 38 1
6 V* RR Tel Sy* 20 04 18.5382966387 -55 43 33.154224077 9.93 11.33 10.81     WN3-6.5+M3.5-7 517 0
7 * 55 Cyg s*b 20 48 56.2911163453 +46 06 50.883966851 4.83 5.28 4.86 4.41 4.10 B4Ia 472 0

    Equat.    Gal    SGal    Ecl

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2020.10.20-10:13:41

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