Low resolution spectroscopy of hot post-AGB 
candidates

Parthasarathy, M.; Vijapurkar, Jyotsna; Drilling, J. S.

doi:10.1051/aas:2000242

Cited by 46 publications

(92 citation statements)

References 20 publications

(37 reference statements)

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“…Our sample contains ten hot post-AGB stars selected from Parthasarathy et al (2000), based on low-resolution spectra, and the Toruń catalogue (Szczerba et al 2007(Szczerba et al , 2011, a recent compilation of post-AGB stars and candidates. Additional references were used to provide complete information about the sample, such as the southern LS, LSS and LSE stars catalogue (Drilling & Bergeron 1995), the low-resolution spectroscopic atlas of post-AGB stars and related objects (Suarez et al 2006) and the compilation of post-AGB objects of Stasińska et al (2006).…”

Section: Observationsmentioning

confidence: 99%

“…Ratag et al (1990) and Umana et al (2004) detected nebular radio emission typical of PNe using the VLA telescopes. Based on IRAS fluxes and spectral type, Parthasarathy et al (2000) classified it as O8III hot post-AGB star. On the other hand, de Wit et al (2005) described SAO 209306 as likely a field star associated to the open cluster Col347.…”

Section: Sao 209306 (Iras 17460-3114)mentioning

confidence: 99%

“…Garcia-Lário et al (1997) obtained near-IR observations for this star and classified it as a post-AGB star. In a study based on lowresolution spectra, Parthasarathy et al (2000) classified it as a hot post-AGB B3IIIe star based on its high galactic latitude, farinfrared colours similar to PNe, and Be spectral type. Using lowresolution UV(IUE) spectra, Gauba & Parthasarathy (2003) estimated the effective temperature and surface gravity as being 17 000 K and 3.4 dex, respectively.…”

Section: Notes On Individual Objects Lse 3 (Iras 17074-1845)mentioning

confidence: 99%

“…Kozok (1985) studied the distribution of Be stars in the Galactic central region and derived a distance to the Sun of 1.9 kpc and M V = −3.08 for this object. Parthasarathy et al (2000), based on low-resolution spectra, classified it as B3Ie hot post-AGB star based on the detected emission in H β . The post-AGB nature was later confirmed by Suarez et al (2006), using low-resolution spectra.…”

Section: Ls 3268 (Iras 14331-6435)mentioning

confidence: 99%

“…Some papers reported modern surveys to detect new hot post-AGB stars and candidates (Oudmaijer 1996). Some works focused on lowresolution spectra of hot post-AGB stars to identify important A&A 543, A11 (2012) spectroscopic characteristics and make a preliminary classification of these objects (Parthasarathy et al 2000). Chemical analyses based on high-resolution spectra have been presented, for example, by McCausland et al (1992), Venn et al (1998), Ryans et al (2003), and Sarkar et al (2005).…”

Section: Introductionmentioning

confidence: 99%

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Chemical abundances of hot post-AGB stars

Mello

Daflon

Pereira

et al. 2012

A&A

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Context. Hot post-AGB stars are luminous objects of low-and intermediate mass (0.8-8 M ) in the final stage of evolution, moving between the asymptotic giant branch (AGB) stars and planetary nebulae. The absorption lines observed in their spectra are typical of early-type stars and their abundance pattern may be associated with the occurence of one or more mixing processes during the previous AGB phase. Aims. To better constrain their observed chemical pattern and evolutionary status, we determined chemical abundances for a sample of hot post-AGB stars selected according to spectroscopic criteria. Methods. The observational data are high-resolution spectra obtained with the FEROS spectrograph. The stellar parameters and chemical composition were obtained from fully consistent non-LTE synthesis.Results. The general abundance pattern reveals relevant nitrogen enrichment, slight depletion in carbon and sulfur and mild excess in helium for most of the objects. One notable exception is LSE 148, with Z = 0.001, which is likely to be a metal-poor object at high galactic latitude. The atmospheric parameters and chemical abundances obtained are discussed in the context of evolutionary models. Mixing processes like the second/third dredged-up and "hot bottom-burning" are invoked to explain the obtained results.

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Section: Observationsmentioning

confidence: 99%

Section: Sao 209306 (Iras 17460-3114)mentioning

confidence: 99%

Section: Notes On Individual Objects Lse 3 (Iras 17074-1845)mentioning

confidence: 99%

Section: Ls 3268 (Iras 14331-6435)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chemical abundances of hot post-AGB stars

Mello

Daflon

Pereira

et al. 2012

A&A

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Hot Post-AGB Stars

Parthasarathy

Gauba

Fujii

et al. 2001

Post-Agb Objects as a Phase of Stellar Evolution

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K-band spectra of selected post-AGB candidates

Parthasarathy

Muthumariappan

Muneer

2020

Astrophys Space Sci

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We present medium resolution (1000) K-band spectra of 12 post-AGB candidates and related stars. For several objects in our sample, these spectra were obtained for the first time. The Brγ line in emission is detected in seven objects indicating the onset of photo-ionization in these objects. Four objects show the presence of He i line. We detect H 2 emission line in the spectra of IRAS 06556+1623, IRAS 22023+5249, IRAS 18062+2410 and IRAS 20462+3416. H 2 emission line ratio 1-0 S(1)/2-1 S(1) indicate that H 2 is radiatively excited due to the UV radiation of hot post-AGB central stars. When compared with the recent observations by other investigators, the Brγ and H 2 emission fluxes varied in some of the objects. The hot post-AGB stars IRAS 22495+5134, IRAS 22023+5249, IRAS 18062+2410 and IRAS 20462+3416 seem to be evolving rapidly to young low excitation planetary nebula phase. The spectra of the objects presented in this paper may be useful for future observers as some of these stars show spectral variation and since the post-AGB evolution of some of these stars is relatively rapid.

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Low resolution spectroscopy of hot post-AGB candidates

Cited by 46 publications

References 20 publications

Chemical abundances of hot post-AGB stars

Chemical abundances of hot post-AGB stars

Hot Post-AGB Stars

K-band spectra of selected post-AGB candidates

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