|
other query modes : |
Identifier query |
Coordinate query |
Criteria query |
Reference query |
Basic query |
Script submission |
TAP |
Output options |
Object types |
Help |
| Query : 2001A&A...376..978K |
2001A&A...376..978K - Astronomy and Astrophysics, volume 376978-981 (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
| 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 - 2026 |
#notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | * zet Cas | bC? | 00 36 58.2844874846 | +53 53 48.877599163 | 2.58 | 3.47 | 3.66 | 3.74 | 3.95 | B2IV | 470 | 0 |
| 2 | * 62 Tau | * | 04 23 59.7627483096 | +24 18 03.527065188 | 6.18 | 6.499 | 6.337 | B3V | 237 | 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 | 751 | 0 |
| 4 | V* RT Ser | Sy* | 17 39 51.9832062720 | -11 56 38.818883580 | 15.979 | 14.649 | 14.461 | M7e | 131 | 0 | ||
| 5 | PN Th 4-4 | Sy* | 17 50 23.8217431800 | -19 53 43.180088784 | 17.5 | 15.63 | 13.21 | M4/6e | 43 | 1 | ||
| 6 | V* RR Tel | Sy* | 20 04 18.5404499712 | -55 43 33.153979080 | 9.93 | 11.33 | 10.81 | 11.689 | M5e | 550 | 0 | |
| 7 | * 55 Cyg | s*b | 20 48 56.2915921440 | +46 06 50.883645024 | 4.83 | 5.28 | 4.86 | 4.41 | 4.10 | B2.5Ia | 506 | 0 |
To bookmark this query, right click on this link: simbad:objects in 2001A&A...376..978K and select 'bookmark this link' or equivalent in the popup menu