Variability in Protoplanetary Nebulae. X. Multiyear Periods as an Indicator of Potential Binaries
New observations are presented of four evolved objects that display long, multiyear variations in their light curves. These are interpreted as good evidence of their binary nature, with the modulation caused by the barycenter motion of the evolved star resulting in a periodic obscuration by a circum...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astronomical Journal |
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| Online Access: | https://doi.org/10.3847/1538-3881/ad0cc4 |
| _version_ | 1797383480084004864 |
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| author | Bruce J. Hrivnak Wenxian Lu Gary Henson Todd C. Hillwig |
| author_facet | Bruce J. Hrivnak Wenxian Lu Gary Henson Todd C. Hillwig |
| author_sort | Bruce J. Hrivnak |
| collection | DOAJ |
| description | New observations are presented of four evolved objects that display long, multiyear variations in their light curves. These are interpreted as good evidence of their binary nature, with the modulation caused by the barycenter motion of the evolved star resulting in a periodic obscuration by a circumbinary disk. Although protoplanetary nebulae (PPNe) commonly possess bipolar nebulae, which are thought to be shaped by a binary companion, there are very few PPNe in which a binary companion has been found. Three of the objects in this study appear to be PPNe, IRAS 07253−2001, 08005−2356, and 17542−0603, with long periods of 5.2, 6.9, and 8.2 yr, respectively. The binary nature of IRAS 08005−2356 has recently been confirmed by a radial velocity study. Two samples, one of PPNe and the other of post-AGB star candidates, are investigated for further evidence on how common is a long-period light-curve variation. Both samples suggest such light-curve variations are not common. The fourth object, IRAS 20056+1834 (QY Sge), is an obscured RV Tau variable of the RVb subclass, with a long period of 3.9 yr and pulsation periods of 102.9 and 51.5 days. The period of this object is seen to vary by 2%. Evidence is presented for a recent mass ejection in IRAS 17542−0603. |
| first_indexed | 2024-03-08T21:20:35Z |
| format | Article |
| id | doaj.art-bdc72f6abe024525a6612c86f67c1dd4 |
| institution | Directory Open Access Journal |
| issn | 1538-3881 |
| language | English |
| last_indexed | 2024-03-08T21:20:35Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj.art-bdc72f6abe024525a6612c86f67c1dd42023-12-21T11:01:31ZengIOP PublishingThe Astronomical Journal1538-38812023-01-0116713010.3847/1538-3881/ad0cc4Variability in Protoplanetary Nebulae. X. Multiyear Periods as an Indicator of Potential BinariesBruce J. Hrivnak0https://orcid.org/0000-0003-1471-8892Wenxian Lu1Gary Henson2Todd C. Hillwig3https://orcid.org/0000-0002-0816-1090Department of Physics and Astronomy, Valparaiso University , Valparaiso, IN 46383, USA ; bruce.hrivnak@valpo.edu, todd.hillwig@valpo.edu, wen.lu@valpo.edu; Southeastern Association for Research in Astronomy (SARA) , USADepartment of Physics and Astronomy, Valparaiso University , Valparaiso, IN 46383, USA ; bruce.hrivnak@valpo.edu, todd.hillwig@valpo.edu, wen.lu@valpo.eduSoutheastern Association for Research in Astronomy (SARA) , USA; Department of Physics and Astronomy, East Tennessee State University , Johnson City, TN 37614, USA ; hensong@mail.etsu.eduDepartment of Physics and Astronomy, Valparaiso University , Valparaiso, IN 46383, USA ; bruce.hrivnak@valpo.edu, todd.hillwig@valpo.edu, wen.lu@valpo.edu; Southeastern Association for Research in Astronomy (SARA) , USANew observations are presented of four evolved objects that display long, multiyear variations in their light curves. These are interpreted as good evidence of their binary nature, with the modulation caused by the barycenter motion of the evolved star resulting in a periodic obscuration by a circumbinary disk. Although protoplanetary nebulae (PPNe) commonly possess bipolar nebulae, which are thought to be shaped by a binary companion, there are very few PPNe in which a binary companion has been found. Three of the objects in this study appear to be PPNe, IRAS 07253−2001, 08005−2356, and 17542−0603, with long periods of 5.2, 6.9, and 8.2 yr, respectively. The binary nature of IRAS 08005−2356 has recently been confirmed by a radial velocity study. Two samples, one of PPNe and the other of post-AGB star candidates, are investigated for further evidence on how common is a long-period light-curve variation. Both samples suggest such light-curve variations are not common. The fourth object, IRAS 20056+1834 (QY Sge), is an obscured RV Tau variable of the RVb subclass, with a long period of 3.9 yr and pulsation periods of 102.9 and 51.5 days. The period of this object is seen to vary by 2%. Evidence is presented for a recent mass ejection in IRAS 17542−0603.https://doi.org/10.3847/1538-3881/ad0cc4Post-asymptotic giant branch starsEvolved starsBinary starsLong period variable starsRV Tauri variable starsProtoplanetary nebulae |
| spellingShingle | Bruce J. Hrivnak Wenxian Lu Gary Henson Todd C. Hillwig Variability in Protoplanetary Nebulae. X. Multiyear Periods as an Indicator of Potential Binaries The Astronomical Journal Post-asymptotic giant branch stars Evolved stars Binary stars Long period variable stars RV Tauri variable stars Protoplanetary nebulae |
| title | Variability in Protoplanetary Nebulae. X. Multiyear Periods as an Indicator of Potential Binaries |
| title_full | Variability in Protoplanetary Nebulae. X. Multiyear Periods as an Indicator of Potential Binaries |
| title_fullStr | Variability in Protoplanetary Nebulae. X. Multiyear Periods as an Indicator of Potential Binaries |
| title_full_unstemmed | Variability in Protoplanetary Nebulae. X. Multiyear Periods as an Indicator of Potential Binaries |
| title_short | Variability in Protoplanetary Nebulae. X. Multiyear Periods as an Indicator of Potential Binaries |
| title_sort | variability in protoplanetary nebulae x multiyear periods as an indicator of potential binaries |
| topic | Post-asymptotic giant branch stars Evolved stars Binary stars Long period variable stars RV Tauri variable stars Protoplanetary nebulae |
| url | https://doi.org/10.3847/1538-3881/ad0cc4 |
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