Modeling the infrared bow shock at δ Velorum: Implications for studies of debris disks and λ boötis stars

A. Gáspár, K. Y L Su, George H. Rieke, Z. Balog, I. Kamp, J. R. Martínez-Galarza, K. Stapelfeldt

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

We have discovered a bow shock shaped mid-infrared excess region in front of δ Velorum using 24 μm observations obtained with the Multiband Imaging Photometer for Spitzer ( MIPS). Although the bow shock morphology was only detected in the 24 μm observations, its excess was also resolved at 70 μm. We show that the stellar heating of an ambient interstellar medium (ISM) cloud can produce the measured flux. Since δ Velorum was classified as a debris disk star previously, our discovery may call into question the same classification of other stars. We model the interaction of the star and ISM, producing images that show the same geometry and surface brightness as is observed. The modeled ISM is ∼15 times overdense relative to the average Local Bubble value, which is surprising considering the close proximity (24 pc) of δ Velorum. The abundance anomalies of λ Boötis stars have been previously explained as arising from the same type of interaction of stars with the ISM. Low-resolution optical spectra of δ Velorum show that it does not belong to this stellar class. The star therefore is an interesting testbed for the ISM accretion theory of the λ Boötis phenomenon.

Original languageEnglish (US)
Pages (from-to)974-983
Number of pages10
JournalAstrophysical Journal
Volume672
Issue number2
DOIs
StatePublished - Jan 10 2008

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photometer
bows
debris
bubble
shock
accretion
heating
anomaly
geometry
stars
modeling
photometers
optical spectrum
proximity
brightness
bubbles
interactions
anomalies

Keywords

  • Infrared: ISM
  • ISM: kinematics and dynamics
  • Radiation mechanisms: thermal
  • Shock waves
  • Stars: evolution
  • Stars: imaging
  • Stars: individual (HD 74956, δ Velorum)

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Gáspár, A., Su, K. Y. L., Rieke, G. H., Balog, Z., Kamp, I., Martínez-Galarza, J. R., & Stapelfeldt, K. (2008). Modeling the infrared bow shock at δ Velorum: Implications for studies of debris disks and λ boötis stars. Astrophysical Journal, 672(2), 974-983. https://doi.org/10.1086/523299

Modeling the infrared bow shock at δ Velorum : Implications for studies of debris disks and λ boötis stars. / Gáspár, A.; Su, K. Y L; Rieke, George H.; Balog, Z.; Kamp, I.; Martínez-Galarza, J. R.; Stapelfeldt, K.

In: Astrophysical Journal, Vol. 672, No. 2, 10.01.2008, p. 974-983.

Research output: Contribution to journalArticle

Gáspár, A, Su, KYL, Rieke, GH, Balog, Z, Kamp, I, Martínez-Galarza, JR & Stapelfeldt, K 2008, 'Modeling the infrared bow shock at δ Velorum: Implications for studies of debris disks and λ boötis stars', Astrophysical Journal, vol. 672, no. 2, pp. 974-983. https://doi.org/10.1086/523299
Gáspár, A. ; Su, K. Y L ; Rieke, George H. ; Balog, Z. ; Kamp, I. ; Martínez-Galarza, J. R. ; Stapelfeldt, K. / Modeling the infrared bow shock at δ Velorum : Implications for studies of debris disks and λ boötis stars. In: Astrophysical Journal. 2008 ; Vol. 672, No. 2. pp. 974-983.
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