The effect of dust obscuration in RR Telescopii on optical and IR long-term photometryand Fe II emission lines

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dc.contributor.authorKotnik-Karuza, D
dc.contributor.authorFriedjung, M
dc.contributor.authorWhitelock, P A
dc.contributor.authorMarang, F
dc.contributor.authorExter, K
dc.contributor.authorKeenan, F P
dc.contributor.authorPollacco, D L
dc.date.accessioned2021-10-08T11:01:02Z
dc.date.available2021-10-08T11:01:02Z
dc.date.issued2006
dc.description.abstractAims. Infrared and optical photometric and spectroscopic observations of the symbiotic nova RR Tel are used to study the effects and properties of dust in symbiotic binaries containing a cool Mira component, as well as showing obscuration events of increased absorption, which are typical for such Miras. Methods. A set of photometric observations of the symbiotic nova RR Tel in different wavelength bands - visual from 1949 to 2002 and near-infrared (JHKL) from 1975 to 2002 - are presented. The variability due to the normal Mira pulsation was removed from the JHKL data, which were then compared with the American Association of Variable Star Observers' (AAVSO) visual light curve. The changes of the Fell emission line fluxes during the 1996-2000 obscuration episode were studied in the optical spectra taken with the Anglo-Australian telescope. Results. We discuss the three periods during which the Mira component was heavily obscured by dust as observed in the different wavelength bands. A change in the correlations of J with other infrared magnitudes was observed with the colour becoming redder alter JD 2 446 600. Generally, J-K was comparable, while K-L was larger than typical values for single Miras. A distance estimate of 2.5 kpc, based on the IR data, is given. A larger flux decrease for the permitted than for the forbidden Fe II lines, during the obscuration episode studied, has been found. There is no evidence for other correlations with line properties, in particular with wavelength, which suggests obscuration due to separate optically thick clouds in the outer layers. Conclusions.
dc.identifier.apacitationKotnik-Karuza, D., Friedjung, M., Whitelock, P. A., Marang, F., Exter, K., Keenan, F. P., & Pollacco, D. L. (2006). The effect of dust obscuration in RR Telescopii on optical and IR long-term photometryand Fe II emission lines. <i>Astronomy and Astrophysics</i>, 452(2), 503 - 510. http://hdl.handle.net/11427/35069en_ZA
dc.identifier.chicagocitationKotnik-Karuza, D, M Friedjung, P A Whitelock, F Marang, K Exter, F P Keenan, and D L Pollacco "The effect of dust obscuration in RR Telescopii on optical and IR long-term photometryand Fe II emission lines." <i>Astronomy and Astrophysics</i> 452, 2. (2006): 503 - 510. http://hdl.handle.net/11427/35069en_ZA
dc.identifier.citationKotnik-Karuza, D., Friedjung, M., Whitelock, P.A., Marang, F., Exter, K., Keenan, F.P. & Pollacco, D.L. 2006. The effect of dust obscuration in RR Telescopii on optical and IR long-term photometryand Fe II emission lines. <i>Astronomy and Astrophysics.</i> 452(2):503 - 510. http://hdl.handle.net/11427/35069en_ZA
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.ris TY - Journal Article AU - Kotnik-Karuza, D AU - Friedjung, M AU - Whitelock, P A AU - Marang, F AU - Exter, K AU - Keenan, F P AU - Pollacco, D L AB - Aims. Infrared and optical photometric and spectroscopic observations of the symbiotic nova RR Tel are used to study the effects and properties of dust in symbiotic binaries containing a cool Mira component, as well as showing obscuration events of increased absorption, which are typical for such Miras. Methods. A set of photometric observations of the symbiotic nova RR Tel in different wavelength bands - visual from 1949 to 2002 and near-infrared (JHKL) from 1975 to 2002 - are presented. The variability due to the normal Mira pulsation was removed from the JHKL data, which were then compared with the American Association of Variable Star Observers' (AAVSO) visual light curve. The changes of the Fell emission line fluxes during the 1996-2000 obscuration episode were studied in the optical spectra taken with the Anglo-Australian telescope. Results. We discuss the three periods during which the Mira component was heavily obscured by dust as observed in the different wavelength bands. A change in the correlations of J with other infrared magnitudes was observed with the colour becoming redder alter JD 2 446 600. Generally, J-K was comparable, while K-L was larger than typical values for single Miras. A distance estimate of 2.5 kpc, based on the IR data, is given. A larger flux decrease for the permitted than for the forbidden Fe II lines, during the obscuration episode studied, has been found. There is no evidence for other correlations with line properties, in particular with wavelength, which suggests obscuration due to separate optically thick clouds in the outer layers. Conclusions. DA - 2006 DB - OpenUCT DP - University of Cape Town IS - 2 J1 - Astronomy and Astrophysics LK - https://open.uct.ac.za PY - 2006 SM - 0004-6361 SM - 1432-0746 T1 - The effect of dust obscuration in RR Telescopii on optical and IR long-term photometryand Fe II emission lines TI - The effect of dust obscuration in RR Telescopii on optical and IR long-term photometryand Fe II emission lines UR - http://hdl.handle.net/11427/35069 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/35069
dc.identifier.vancouvercitationKotnik-Karuza D, Friedjung M, Whitelock PA, Marang F, Exter K, Keenan FP, et al. The effect of dust obscuration in RR Telescopii on optical and IR long-term photometryand Fe II emission lines. Astronomy and Astrophysics. 2006;452(2):503 - 510. http://hdl.handle.net/11427/35069.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Astronomy
dc.publisher.facultyFaculty of Science
dc.sourceAstronomy and Astrophysics
dc.source.journalissue2
dc.source.journalvolume452
dc.source.pagination503 - 510
dc.source.urihttps://dx.doi.org/10.1051/0004-6361:20054190
dc.subject.otherstars: binaries: symbiotic
dc.subject.otherstars: individual: RR Tel
dc.subject.otherstars: circumstellar matter
dc.subject.otherCircumstellar matter
dc.subject.otherSymbiotic stars
dc.subject.otherBinary stars
dc.subject.otherForbidden line
dc.subject.otherColor
dc.subject.otherCorrelations
dc.subject.otherOptical spectrum
dc.subject.otherLight curves
dc.subject.otherVariability
dc.subject.otherNovae
dc.subject.otherSpectroscopical observation
dc.subject.otherPhotometric observation
dc.subject.otherEmission line
dc.subject.otherInfrared photometry
dc.subject.otherMatière circumstellaire
dc.subject.otherEtoile symbiotique
dc.subject.otherBinaire
dc.subject.otherRaie interdite
dc.subject.otherCouleur
dc.subject.otherCorrélation
dc.subject.otherSpectre optique
dc.subject.otherCourbe lumière
dc.titleThe effect of dust obscuration in RR Telescopii on optical and IR long-term photometryand Fe II emission lines
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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