HST and VLT observations of the symbiotic star Hen 2–147: Its nebular dynamics, its Mira variable and its distance

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dc.contributor.authorSantander-García, M
dc.contributor.authorCorradi, R L M
dc.contributor.authorWhitelock, P A
dc.contributor.authorMunari, U
dc.contributor.authorMampaso, A
dc.contributor.authorMarang, F
dc.contributor.authorBoffi, F
dc.contributor.authorLivio, M
dc.date.accessioned2021-10-08T11:01:03Z
dc.date.available2021-10-08T11:01:03Z
dc.date.issued2007
dc.description.abstractAims. We investigate the dynamics of the nebula around the symbiotic star Hen 2-147, determine its expansion parallax, and compare it with the distance obtained via the period-luminosity relation for its Mira variable. Methods. A combination of multi-epoch HST images and VLT integral field high-resolution spectroscopy is used to study the nebular dynamics both along the line of sight and in the plane of the sky. These observations allow us to build a 3D spatio-kinematical model of the nebula, which, together with the measurement of its apparent expansion in the plane of the sky over a period of 3 years, provides the expansion parallax for the nebula. Additionally, SAAO near-infrared photometry obtained over 25 years is used to determine the Mira pulsation period and derive an independent distance estimation via the period-luminosity relationship for Mira variables. Results. The geometry of the nebula is found to be that of a knotty annulus of ionized gas inclined to the plane of sky and expanding with a velocity of similar to 90 km s(-1). A straightforward application of the expansion parallax method provides a distance of 1.5 +/- 0.4 kpc, which is a factor of two lower than the distance of 3.0 +/- 0.4 kpc obtained from the period-luminosity relationship for the Mira (which has a pulsation period of 373 days). The discrepancy is removed if, instead of expanding matter, we are observing the expansion of a shock front in the plane of the sky. This shock interpretation is further supported by the broadening of the nebular emission lines.
dc.identifier.apacitationSantander-García, M., Corradi, R. L. M., Whitelock, P. A., Munari, U., Mampaso, A., Marang, F., ... Livio, M. (2007). HST and VLT observations of the symbiotic star Hen 2–147: Its nebular dynamics, its Mira variable and its distance. <i>Astronomy and Astrophysics</i>, 465(2), 481 - 491. http://hdl.handle.net/11427/35074en_ZA
dc.identifier.chicagocitationSantander-García, M, R L M Corradi, P A Whitelock, U Munari, A Mampaso, F Marang, F Boffi, and M Livio "HST and VLT observations of the symbiotic star Hen 2–147: Its nebular dynamics, its Mira variable and its distance." <i>Astronomy and Astrophysics</i> 465, 2. (2007): 481 - 491. http://hdl.handle.net/11427/35074en_ZA
dc.identifier.citationSantander-García, M., Corradi, R.L.M., Whitelock, P.A., Munari, U., Mampaso, A., Marang, F., Boffi, F. & Livio, M. et al. 2007. HST and VLT observations of the symbiotic star Hen 2–147: Its nebular dynamics, its Mira variable and its distance. <i>Astronomy and Astrophysics.</i> 465(2):481 - 491. http://hdl.handle.net/11427/35074en_ZA
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.ris TY - Journal Article AU - Santander-García, M AU - Corradi, R L M AU - Whitelock, P A AU - Munari, U AU - Mampaso, A AU - Marang, F AU - Boffi, F AU - Livio, M AB - Aims. We investigate the dynamics of the nebula around the symbiotic star Hen 2-147, determine its expansion parallax, and compare it with the distance obtained via the period-luminosity relation for its Mira variable. Methods. A combination of multi-epoch HST images and VLT integral field high-resolution spectroscopy is used to study the nebular dynamics both along the line of sight and in the plane of the sky. These observations allow us to build a 3D spatio-kinematical model of the nebula, which, together with the measurement of its apparent expansion in the plane of the sky over a period of 3 years, provides the expansion parallax for the nebula. Additionally, SAAO near-infrared photometry obtained over 25 years is used to determine the Mira pulsation period and derive an independent distance estimation via the period-luminosity relationship for Mira variables. Results. The geometry of the nebula is found to be that of a knotty annulus of ionized gas inclined to the plane of sky and expanding with a velocity of similar to 90 km s(-1). A straightforward application of the expansion parallax method provides a distance of 1.5 +/- 0.4 kpc, which is a factor of two lower than the distance of 3.0 +/- 0.4 kpc obtained from the period-luminosity relationship for the Mira (which has a pulsation period of 373 days). The discrepancy is removed if, instead of expanding matter, we are observing the expansion of a shock front in the plane of the sky. This shock interpretation is further supported by the broadening of the nebular emission lines. DA - 2007 DB - OpenUCT DP - University of Cape Town IS - 2 J1 - Astronomy and Astrophysics LK - https://open.uct.ac.za PY - 2007 SM - 0004-6361 SM - 1432-0746 T1 - HST and VLT observations of the symbiotic star Hen 2–147: Its nebular dynamics, its Mira variable and its distance TI - HST and VLT observations of the symbiotic star Hen 2–147: Its nebular dynamics, its Mira variable and its distance UR - http://hdl.handle.net/11427/35074 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/35074
dc.identifier.vancouvercitationSantander-García M, Corradi RLM, Whitelock PA, Munari U, Mampaso A, Marang F, et al. HST and VLT observations of the symbiotic star Hen 2–147: Its nebular dynamics, its Mira variable and its distance. Astronomy and Astrophysics. 2007;465(2):481 - 491. http://hdl.handle.net/11427/35074.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Mathematics and Applied Mathematics
dc.publisher.facultyFaculty of Science
dc.sourceAstronomy and Astrophysics
dc.source.journalissue2
dc.source.journalvolume465
dc.source.pagination481 - 491
dc.source.urihttps://dx.doi.org/10.1051/0004-6361:20065875
dc.subject.otherbinaries: symbiotic
dc.subject.otherplanetary nebulae: individual: Hen 2-147
dc.subject.otherISM: kinematics and dynamics
dc.subject.otherKinematics
dc.subject.otherPlanetary nebulae
dc.subject.otherEmission line
dc.subject.otherShock front
dc.subject.otherIonized gases
dc.subject.otherLuminosity
dc.subject.otherInfrared photometry
dc.subject.otherThree dimensional model
dc.subject.otherSpectroscopy
dc.subject.otherHigh field
dc.subject.otherMultiple image
dc.subject.otherPeriod luminosity relation
dc.subject.otherMira stars
dc.subject.otherDynamics
dc.subject.otherSymbiotic stars
dc.subject.otherCinématique
dc.subject.otherNébuleuse planétaire
dc.subject.otherRaie émission
dc.subject.otherFront choc
dc.subject.otherGaz ionisé
dc.subject.otherLuminosité
dc.subject.otherPhotométrie IR
dc.titleHST and VLT observations of the symbiotic star Hen 2–147: Its nebular dynamics, its Mira variable and its distance
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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