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Browsing by Author "Manchado, A"

Browsing by Author "Manchado, A"

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  • First evidence of the possible detection of diffuse circumstellar bands in AGB descendants 
    Di­az-Luis, J. J; Garcia-Hernandez, D. A; Kameswara Rao, N; Manchado, A; Cataldo, F (Societa Astronomica Italiana, 2016-06)
    The short transition phase between asymptotic giant branch stars (AGB; when circumstellar envelopes rich in small organic molecules are efficiently created) and planetary nebulae (PNe) represents a most active phase of ...
  • High resolution spectroscopy of the high latitude rapidly evolving post-AGB star SAO 85766 (= IRAS 18062+2410) 
    Parthasarathy, M; García-Lario, P; Sivarani, T; Manchado, A; Sanz Fernández de Córdoba, L (European Southern Observatory, 2000-05)
    SAO 85766 (b = +20o) is an IRAS source with far-infrared colours similar to planetary nebulae. According to the HDE catalogue, its spectrum in 1940 was that of an A5 star. The UV fluxes and colours derived from data obtained ...
  • A multiwavelength study of LS II+34 26: a hot post-AGB star in the process of becoming a planetary nebula 
    Garcia-Lario, P; Parthasarathy, M; de Martino, D; Sanz Fernandez de Cordoba, L; Monier, R; Manchado, A; Pottasch, S. R (European Southern Observatory, 1997-10)
    We present the results from a multiwavelength analysis of LS II+34 26, recently identified as a low mass post-AGB star and not a massive population I B-type star, as previously thought. We confirm that the central star is ...
  • Nebular emission lines in IRAS 10215-5916 
    Garcia-Lario, P; Manchado, A; Parthasarathy, M; Pottasch, S. R (European Southern Observatory, 1994-05)
    From low and high resolution spectroscopic observations of IRAS 10215-5916 we have discovered the presence of nebular emission lines in this G-type supergiant star in the post-AGB stage. From its high resolution spectrum ...
  • A New Near-IR C2 Linelist for an Improved Chemical Analysis of Hydrogen-deficient, Carbon-rich Giants\unboldmath 
    Garcia-Hernandez, D. A; Masseron, T; Zamora, O; Manchado, A; Rao, N. K; Reddy, A. B. S; Lambert, D. L; Yurchenko, S; Tennyson, J (Astronomical Society of the Pacific, 2019)
    Diatomic carbon (C2) is ubiquitous in astronomical environments, from comets and stars to translucent clouds and the interstellar medium. In particular, the C2 bands (mainly the Ballik-Ramsay and Phillips transitions) are ...
  • A search for diffuse bands in fullerene planetary nebulae: evidence of diffuse circumstellar bands 
    Diaz-Luis, J. J; Garcia-Hernandez, D. A; Kameswara Rao, N; Manchado, A; Cataldo, F (EDP Sciences, 2015-01)
    Large fullerenes and fullerene-based molecules have been proposed as carriers of diffuse interstellar bands (DIBs). The recent detection of the most common fullerenes (C60 and C70) around some planetary nebulae (PNe) now ...
  • Spectroscopy of HD 168625 (IRAS 18184-1623) 
    García, L. P; Sivarani, T; Parthasarathy, M; Manchado, A (Kluwer Academic Publishers, 2001-08)
    HD 168625 (B9-A0 Ia) was classified as a post-AGB star and also as a luminous blue variable. We have analysed the high resolution optical spectra of HD 168625 and derived the atmospheric parameters and the chemical ...
  • Spectroscopy of post-AGB a-supergiant HD 101584 (IRAS 11385-5517) 
    Sivarani, T; Parthasarathy, M; García, L. P; Manchado, A; Pottasch, S. R (Kluwer Academic Publishers, 2001-08)
    In the high resolution optical spectra we identified forbidden lines of [OI] and [CI], which indicate the presence of low excitation nebula. There are many emission lines due forbidden and permitted lines of neutral and ...
  • Spectroscopy of post-AGB candidate HD 331319 (IRAS 19475+3119) 
    Sivarani, T; Parthasarathy, M; García, L. P; Manchado, A (Kluwer Academic Publishers, 2001-08)
    HD 331319 is a F3 Ib star with a detached cold circumstellar dust shell with far-IR colours similar to planetary nebulae. From an analysis of high resolution spectra using LTE stellar atmospheric models, we have derived ...
  • Spectroscopy of post-AGB candidate IRAS 10215-5916 
    Sivarani, T; Parthasarathy, M; García, L. P; Manchado, A (Kluwer Academic Publishers, 2001-08)
    IRAS 10215-5916 was classified as a post-AGB star and also as a massive red supergiant. It was also found to be a spectroscopic binary. In our high resolution spectra we found molecular features from a cool star of Teff = ...
  • Spectroscopy of the post-AGB star HD 101584 (IRAS 11385-5517) 
    Sivarani, T; Parthasarathy, M; García-Lario, P; Manchado, A; Pottasch, S. R (The European Southern Observatory, 1999-06)
    From an analysis of the spectrum (4000 Ä to 8800 Ä) of HD 101584 it is found that most of the neutral and single ionized metallic lines are in emission. The forbidden emission lines of [OI] 6300 Ä and 6363 Ä and [CI] 8727 ...

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