Eta car: The good, the bad and the ugly of nebular and stellar confusion

K. E. Nielsen; G. Vieira Kober; T. R. Gull; R. Iping; D. J. Hillier; G. Sonneborn; A. G. Jensen

doi:10.1063/1.3154039

Eta car: The good, the bad and the ugly of nebular and stellar confusion

K. E. Nielsen, G. Vieira Kober, T. R. Gull, R. Iping, D. J. Hillier, G. Sonneborn, A. G. Jensen

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Observations in the far-UV provide a unique opportunity to investigate the very massive star 7] Car and its hot binary companion, 7] Car B. 7] Car was observed with FUSE over a large portion of the 5.54 year spectroscopic period before and after the 2003.5 minimum. The observed spectrum is defined by strong stellar wind signatures, primarily from 7] Car A, complicated by the strong absorptions of the ejecta surrounding 7] Car plus interstellar absorption. The Homunculus and Little Homunculus are massive bipolar ejecta historically associable with LBV outbursts in the 1840s and the 1890s and are linked to absorptions at -513 and -146 km s- 1, respectively. The FUSE spectra are confused by the extended nebulosity and thermal drifting of the FUSE co-pointed instruments. Interpretation is further complicated by two B-stars sufficiently close to 7] Car to be included most of the time in the large FUSE aperture. Followup observations partially succeeded in obtaining spectra of at least one of these B-stars through the smaller apertures, allowing potential separation of the B-star contributions and 7] Car. A complete analysis of all available spectra is currently underway. Our ultimate goals are to directly detect the hot secondary star i f possible with FUSE and to identify the absorption contributions to the overall spectrum especially of the stellar members and the massive ejecta.

Original language	English (US)
Title of host publication	Future Directions in Ultraviolet Spectroscopy - A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic Explorer Mission
Pages	162-164
Number of pages	3
DOIs	https://doi.org/10.1063/1.3154039
State	Published - 2009
Externally published	Yes
Event	Future Directions in Ultraviolet Spectroscopy Conference - Annapolis, MD, United States Duration: Oct 20 2008 → Oct 22 2008

Publication series

Name	AIP Conference Proceedings
Volume	1135
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Other

Other	Future Directions in Ultraviolet Spectroscopy Conference
Country	United States
City	Annapolis, MD
Period	10/20/08 → 10/22/08

Keywords

Individual stars: eta carinae
Spectroscopy

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1063/1.3154039

Fingerprint Dive into the research topics of 'Eta car: The good, the bad and the ugly of nebular and stellar confusion'. Together they form a unique fingerprint.

Cite this

Nielsen, K. E., Vieira Kober, G., Gull, T. R., Iping, R., Hillier, D. J., Sonneborn, G., & Jensen, A. G. (2009). Eta car: The good, the bad and the ugly of nebular and stellar confusion. In Future Directions in Ultraviolet Spectroscopy - A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic Explorer Mission (pp. 162-164). (AIP Conference Proceedings; Vol. 1135). https://doi.org/10.1063/1.3154039

Eta car : The good, the bad and the ugly of nebular and stellar confusion. / Nielsen, K. E.; Vieira Kober, G.; Gull, T. R.; Iping, R.; Hillier, D. J.; Sonneborn, G.; Jensen, A. G.

Future Directions in Ultraviolet Spectroscopy - A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic Explorer Mission. 2009. p. 162-164 (AIP Conference Proceedings; Vol. 1135).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Nielsen, KE, Vieira Kober, G, Gull, TR, Iping, R, Hillier, DJ, Sonneborn, G & Jensen, AG 2009, Eta car: The good, the bad and the ugly of nebular and stellar confusion. in Future Directions in Ultraviolet Spectroscopy - A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic Explorer Mission. AIP Conference Proceedings, vol. 1135, pp. 162-164, Future Directions in Ultraviolet Spectroscopy Conference, Annapolis, MD, United States, 10/20/08. https://doi.org/10.1063/1.3154039

Nielsen KE, Vieira Kober G, Gull TR, Iping R, Hillier DJ, Sonneborn G et al. Eta car: The good, the bad and the ugly of nebular and stellar confusion. In Future Directions in Ultraviolet Spectroscopy - A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic Explorer Mission. 2009. p. 162-164. (AIP Conference Proceedings). https://doi.org/10.1063/1.3154039

Nielsen, K. E. ; Vieira Kober, G. ; Gull, T. R. ; Iping, R. ; Hillier, D. J. ; Sonneborn, G. ; Jensen, A. G. / Eta car : The good, the bad and the ugly of nebular and stellar confusion. Future Directions in Ultraviolet Spectroscopy - A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic Explorer Mission. 2009. pp. 162-164 (AIP Conference Proceedings).

@inproceedings{32b4ecf7f74b440c853bccb4141b9741,

title = "Eta car: The good, the bad and the ugly of nebular and stellar confusion",

abstract = "Observations in the far-UV provide a unique opportunity to investigate the very massive star 7] Car and its hot binary companion, 7] Car B. 7] Car was observed with FUSE over a large portion of the 5.54 year spectroscopic period before and after the 2003.5 minimum. The observed spectrum is defined by strong stellar wind signatures, primarily from 7] Car A, complicated by the strong absorptions of the ejecta surrounding 7] Car plus interstellar absorption. The Homunculus and Little Homunculus are massive bipolar ejecta historically associable with LBV outbursts in the 1840s and the 1890s and are linked to absorptions at -513 and -146 km s- 1, respectively. The FUSE spectra are confused by the extended nebulosity and thermal drifting of the FUSE co-pointed instruments. Interpretation is further complicated by two B-stars sufficiently close to 7] Car to be included most of the time in the large FUSE aperture. Followup observations partially succeeded in obtaining spectra of at least one of these B-stars through the smaller apertures, allowing potential separation of the B-star contributions and 7] Car. A complete analysis of all available spectra is currently underway. Our ultimate goals are to directly detect the hot secondary star i f possible with FUSE and to identify the absorption contributions to the overall spectrum especially of the stellar members and the massive ejecta.",

keywords = "Individual stars: eta carinae, Spectroscopy",

author = "Nielsen, {K. E.} and {Vieira Kober}, G. and Gull, {T. R.} and R. Iping and Hillier, {D. J.} and G. Sonneborn and Jensen, {A. G.}",

year = "2009",

doi = "10.1063/1.3154039",

language = "English (US)",

isbn = "9780735406728",

series = "AIP Conference Proceedings",

pages = "162--164",

booktitle = "Future Directions in Ultraviolet Spectroscopy - A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic Explorer Mission",

}

TY - GEN

T1 - Eta car

T2 - Future Directions in Ultraviolet Spectroscopy Conference

AU - Nielsen, K. E.

AU - Vieira Kober, G.

AU - Gull, T. R.

AU - Iping, R.

AU - Hillier, D. J.

AU - Sonneborn, G.

AU - Jensen, A. G.

PY - 2009

Y1 - 2009

N2 - Observations in the far-UV provide a unique opportunity to investigate the very massive star 7] Car and its hot binary companion, 7] Car B. 7] Car was observed with FUSE over a large portion of the 5.54 year spectroscopic period before and after the 2003.5 minimum. The observed spectrum is defined by strong stellar wind signatures, primarily from 7] Car A, complicated by the strong absorptions of the ejecta surrounding 7] Car plus interstellar absorption. The Homunculus and Little Homunculus are massive bipolar ejecta historically associable with LBV outbursts in the 1840s and the 1890s and are linked to absorptions at -513 and -146 km s- 1, respectively. The FUSE spectra are confused by the extended nebulosity and thermal drifting of the FUSE co-pointed instruments. Interpretation is further complicated by two B-stars sufficiently close to 7] Car to be included most of the time in the large FUSE aperture. Followup observations partially succeeded in obtaining spectra of at least one of these B-stars through the smaller apertures, allowing potential separation of the B-star contributions and 7] Car. A complete analysis of all available spectra is currently underway. Our ultimate goals are to directly detect the hot secondary star i f possible with FUSE and to identify the absorption contributions to the overall spectrum especially of the stellar members and the massive ejecta.

AB - Observations in the far-UV provide a unique opportunity to investigate the very massive star 7] Car and its hot binary companion, 7] Car B. 7] Car was observed with FUSE over a large portion of the 5.54 year spectroscopic period before and after the 2003.5 minimum. The observed spectrum is defined by strong stellar wind signatures, primarily from 7] Car A, complicated by the strong absorptions of the ejecta surrounding 7] Car plus interstellar absorption. The Homunculus and Little Homunculus are massive bipolar ejecta historically associable with LBV outbursts in the 1840s and the 1890s and are linked to absorptions at -513 and -146 km s- 1, respectively. The FUSE spectra are confused by the extended nebulosity and thermal drifting of the FUSE co-pointed instruments. Interpretation is further complicated by two B-stars sufficiently close to 7] Car to be included most of the time in the large FUSE aperture. Followup observations partially succeeded in obtaining spectra of at least one of these B-stars through the smaller apertures, allowing potential separation of the B-star contributions and 7] Car. A complete analysis of all available spectra is currently underway. Our ultimate goals are to directly detect the hot secondary star i f possible with FUSE and to identify the absorption contributions to the overall spectrum especially of the stellar members and the massive ejecta.

KW - Individual stars: eta carinae

KW - Spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=71949094154&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=71949094154&partnerID=8YFLogxK

U2 - 10.1063/1.3154039

DO - 10.1063/1.3154039

M3 - Conference contribution

AN - SCOPUS:71949094154

SN - 9780735406728

T3 - AIP Conference Proceedings

SP - 162

EP - 164

BT - Future Directions in Ultraviolet Spectroscopy - A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic Explorer Mission

Y2 - 20 October 2008 through 22 October 2008

ER -