1997A&A...321L..17A

Query : 1997A&A...321L..17A

1997A&A...321L..17A - Astronomy and Astrophysics, volume 321, L17-20 (1997/5-2)

A stellar endgame - the born-again Sakurai's object.

ASPLUND M., GUSTAFSSON B., LAMBERT D.L. and RAO N.K.

Abstract (from CDS):

The surface chemical composition of this remarkable star shows that it is hydrogen-deficient, carbon-rich and enriched in the light s-process elements. Spectra taken in May and October 1996 indicate a decrease in the surface hydrogen abundance by 0.7dex in five months along with an increase in the abundances of Li, Sr, Y and Zr. The abundance changes are in agreement with the hypothesis of the star being a rapidly evolving "born-again" AGB star experiencing a final He-shell flash, similar to FGSge. The ¹²C/¹³C ratio in October is very low, also suggesting hydrogen ingestion. By chemical composition, Sakurai's object resembles the R Coronae Borealis (RCrB) stars.

Abstract Copyright: ∼

Journal keyword(s): stars: individual: Sakurai's object - Stars: evolution - Stars: AGB and post-AGB - Stars: abundances - Stars: variables: other - stars: individual: FG Sge

Simbad objects: 13

View the references in ADS

Number of rows : 13

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2022
1	SMP LMC 83	PN	05 36 20.7215081304	-67 18 07.658262756	15.56	16.225	14.948		16.558	[WN4.5:]	142
2	PN A66 30	PN	08 46 53.4639874872	+17 52 46.369394580		14.23	14.30	13.47		[WC5]	400
3	V* DY Cen	RC*	13 25 34.0847063328	-54 14 43.129581792			12.00			C-Hd/B5-6Ie	90
4	V* V854 Cen	RC*	14 34 49.4024471640	-39 33 19.201288284		7.13	11.69			Ce	203
5	V* V4334 Sgr	CV*	17 52 32.69352	-17 41 08.0160						F2Ia	352
6	V* V3795 Sgr	RC*	18 13 23.5642449000	-25 46 40.857266928				10.940	10.10	~	41
7	V* VZ Sgr	RC*	18 15 08.5724613648	-29 42 29.491053228		11.15	10.46			~	49
8	V* V348 Sgr	pA*	18 40 19.9290428808	-22 54 29.308207716		12.1				B0/1?I?e	179
9	V* V CrA	RC*	18 47 32.3131482	-38 09 32.324962		10.67	8.30			R0	103
10	PN A66 58	PN	19 18 20.476	+01 46 59.62						[WC4]	301
11	Hen 1-5	pA*	20 11 56.0595568008	+20 20 04.420944132	11.41	10.66	9.45			G8/K0Iae	497
12	PN A66 78	PN	21 35 29.3816259120	+31 41 45.449196108		13.04	13.25			[WC5]	316
13	V* U Aqr	RC*	22 03 19.6990459464	-16 37 35.281076700		12.16	11.17			C-Hd	89

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