Strong helium 10 830-Å absorption in Sakurai's object (V4334 Sgr)

S. P. S. Eyres; B. Smalley; T. R. Geballe; M. Asplund; V. H. Tyne; A. Evans

doi:10.1046/j.1365-8711.1999.02791.x

Strong helium 10 830-Å absorption in Sakurai's object (V4334 Sgr)

S. P. S. Eyres, B. Smalley, T. R. Geballe, M. Asplund, V. H. Tyne, A. Evans

Faculty of Computing, Engineering and Science

Research output: Contribution to journal › Article › peer-review

Abstract

We report the appearance and evolution during 1998 of strong neutral helium ^3S-^3P^o absorption at ~10830Å in Sakurai's Object (V4334 Sgr), which is believed to be a planetary nebula nucleus (PNN) undergoing a final helium shell-flash. First detected on 1998 March 18, the profile of the Hei feature is P Cygni-like. The absorption depth has increased in three subsequent spectra in 1998. If this is owing to a wind, the profile indicates a wind velocity of ~670+/-50kms^-1. The strong Ci 10690-Å line seen prior to the appearance of the helium feature has disappeared; however Srii and CN absorption features remain present. We tentatively identify several new features as Sii. Taken together with other observations we suggest that the data are consistent with Sakurai's Object entering a phase in which it seems to have become a member of the R Coronae Borealis-type class of stars.

Original language	English
Pages (from-to)	L11-L15
Journal	Monthly Notices of the Royal Astronomical Society
Volume	307
Issue number	1
DOIs	https://doi.org/10.1046/j.1365-8711.1999.02791.x
Publication status	Published - 21 Jul 1999

Keywords

stars: AGB and post-AGB
circumstellar matter
stars: individual: Sakurai's Object
stars: individual: V4334 Sgr
infrared: stars

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10.1046/j.1365-8711.1999.02791.xLicence: CC BY-NC-ND

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title = "Strong helium 10 830-{\AA} absorption in Sakurai's object (V4334 Sgr)",

abstract = "We report the appearance and evolution during 1998 of strong neutral helium ^3S-^3P^o absorption at ~10830{\AA} in Sakurai's Object (V4334 Sgr), which is believed to be a planetary nebula nucleus (PNN) undergoing a final helium shell-flash. First detected on 1998 March 18, the profile of the Hei feature is P Cygni-like. The absorption depth has increased in three subsequent spectra in 1998. If this is owing to a wind, the profile indicates a wind velocity of ~670+/-50kms^-1. The strong Ci 10690-{\AA} line seen prior to the appearance of the helium feature has disappeared; however Srii and CN absorption features remain present. We tentatively identify several new features as Sii. Taken together with other observations we suggest that the data are consistent with Sakurai's Object entering a phase in which it seems to have become a member of the R Coronae Borealis-type class of stars.",

keywords = "stars: AGB and post-AGB, circumstellar matter, stars: individual: Sakurai's Object, stars: individual: V4334 Sgr, infrared: stars",

author = "Eyres, {S. P. S.} and B. Smalley and Geballe, {T. R.} and M. Asplund and Tyne, {V. H.} and A. Evans",

year = "1999",

month = jul,

day = "21",

doi = "10.1046/j.1365-8711.1999.02791.x",

language = "English",

volume = "307",

pages = "L11--L15",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

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TY - JOUR

T1 - Strong helium 10 830-Å absorption in Sakurai's object (V4334 Sgr)

AU - Eyres, S. P. S.

AU - Smalley, B.

AU - Geballe, T. R.

AU - Asplund, M.

AU - Tyne, V. H.

AU - Evans, A.

PY - 1999/7/21

Y1 - 1999/7/21

N2 - We report the appearance and evolution during 1998 of strong neutral helium ^3S-^3P^o absorption at ~10830Å in Sakurai's Object (V4334 Sgr), which is believed to be a planetary nebula nucleus (PNN) undergoing a final helium shell-flash. First detected on 1998 March 18, the profile of the Hei feature is P Cygni-like. The absorption depth has increased in three subsequent spectra in 1998. If this is owing to a wind, the profile indicates a wind velocity of ~670+/-50kms^-1. The strong Ci 10690-Å line seen prior to the appearance of the helium feature has disappeared; however Srii and CN absorption features remain present. We tentatively identify several new features as Sii. Taken together with other observations we suggest that the data are consistent with Sakurai's Object entering a phase in which it seems to have become a member of the R Coronae Borealis-type class of stars.

AB - We report the appearance and evolution during 1998 of strong neutral helium ^3S-^3P^o absorption at ~10830Å in Sakurai's Object (V4334 Sgr), which is believed to be a planetary nebula nucleus (PNN) undergoing a final helium shell-flash. First detected on 1998 March 18, the profile of the Hei feature is P Cygni-like. The absorption depth has increased in three subsequent spectra in 1998. If this is owing to a wind, the profile indicates a wind velocity of ~670+/-50kms^-1. The strong Ci 10690-Å line seen prior to the appearance of the helium feature has disappeared; however Srii and CN absorption features remain present. We tentatively identify several new features as Sii. Taken together with other observations we suggest that the data are consistent with Sakurai's Object entering a phase in which it seems to have become a member of the R Coronae Borealis-type class of stars.

KW - stars: AGB and post-AGB

KW - circumstellar matter

KW - stars: individual: Sakurai's Object

KW - stars: individual: V4334 Sgr

KW - infrared: stars

U2 - 10.1046/j.1365-8711.1999.02791.x

DO - 10.1046/j.1365-8711.1999.02791.x

M3 - Article

SN - 0035-8711

VL - 307

SP - L11-L15

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

Strong helium 10 830-Å absorption in Sakurai's object (V4334 Sgr)

Abstract

Keywords

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