BINARY CENTRAL STARS of PLANETARY NEBULAE DISCOVERED THROUGH PHOTOMETRIC VARIABILITY. IV. the CENTRAL STARS of HaTr 4 and Hf 2-2

Todd C. Hillwig, Howard E. Bond, David J. Frew, S. C. Schaub, Eva H.L. Bodman

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We explore the photometrically variable central stars of the planetary nebulae HaTr 4 and Hf 2-2. Both have been classified as close binary star systems previously based on their light curves alone. Here, we present additional arguments and data confirming the identification of both as close binaries with an irradiated cool companion to the hot central star. We include updated light curves, orbital periods, and preliminary binary modeling for both systems. We also identify for the first time the central star of HaTr 4 as an eclipsing binary. Neither system has been well studied in the past, but we utilize the small amount of existing data to limit possible binary parameters, including system inclination. These parameters are then compared to nebular parameters to further our knowledge of the relationship between binary central stars of planetary nebulae and nebular shaping and ejection.

Original languageEnglish (US)
Article number34
JournalAstronomical Journal
Volume152
Issue number2
DOIs
StatePublished - Aug 2016

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planetary nebulae
stars
light curve
binary stars
ejection
inclination
orbitals
modeling
parameter

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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title = "BINARY CENTRAL STARS of PLANETARY NEBULAE DISCOVERED THROUGH PHOTOMETRIC VARIABILITY. IV. the CENTRAL STARS of HaTr 4 and Hf 2-2",
abstract = "We explore the photometrically variable central stars of the planetary nebulae HaTr 4 and Hf 2-2. Both have been classified as close binary star systems previously based on their light curves alone. Here, we present additional arguments and data confirming the identification of both as close binaries with an irradiated cool companion to the hot central star. We include updated light curves, orbital periods, and preliminary binary modeling for both systems. We also identify for the first time the central star of HaTr 4 as an eclipsing binary. Neither system has been well studied in the past, but we utilize the small amount of existing data to limit possible binary parameters, including system inclination. These parameters are then compared to nebular parameters to further our knowledge of the relationship between binary central stars of planetary nebulae and nebular shaping and ejection.",
author = "Hillwig, {Todd C.} and Bond, {Howard E.} and Frew, {David J.} and Schaub, {S. C.} and Bodman, {Eva H.L.}",
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BINARY CENTRAL STARS of PLANETARY NEBULAE DISCOVERED THROUGH PHOTOMETRIC VARIABILITY. IV. the CENTRAL STARS of HaTr 4 and Hf 2-2. / Hillwig, Todd C.; Bond, Howard E.; Frew, David J.; Schaub, S. C.; Bodman, Eva H.L.

In: Astronomical Journal, Vol. 152, No. 2, 34, 08.2016.

Research output: Contribution to journalArticle

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