Gourdji, K.

Henrichs, H.F.

Oostrum, L.C.

Wijngaarden, M.J.P.

English

We report a very strong optical outburst of the B[e]/transient X-ray system CI Cam/XTE J0421+560. On 2016 Oct 09.064 we measured H alpha at 80 times the continuum flux level, similar to the previous reported outbursts in 1998 (Hynes et al., 2002) and 2005 (Yan et al., 2007)

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UvA-DARE is a service provided by the library of the University of Amsterdam (https://dare.uva.nl)UvA-DARE (Digital Academic Repository)Optical outburst of the B[e]/X-Ray system CI Cam/XTE J0421+560Wijngaarden, M.J.P.; Gourdji, K.; Oostrum, L.C.; Henrichs, H.F.Publication date2016Document VersionFinal published versionPublished inThe astronomer's telegramLicenseUnspecifiedLink to publicationCitation for published version (APA):Wijngaarden, M. J. P., Gourdji, K., Oostrum, L. C., & Henrichs, H. F. (2016). Optical outburstof the B[e]/X-Ray system CI Cam/XTE J0421+560. The astronomer's telegram, 9634.http://www.astronomerstelegram.org/?read=9634General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s)and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an opencontent license (like Creative Commons).Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, pleaselet the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the materialinaccessible and/or remove it from the website. Please Ask the Library: https://uba.uva.nl/en/contact, or a letterto: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. Youwill be contacted as soon as possible.Download date:09 Mar 2023ATel #9634: Optical outburst of the B[e]/X-Ray system CI Cam/XTE J0421+560http://www.astronomerstelegram.org/?read=9634[5-6-2020 11:02:12]OutsideGCNIAUCsOther ATel on Twitter and FacebookATELstreamATel Community SitePost | Search | PoliciesCredential | Feeds | Email5 Jun 2020; 09:01 UTThis space for free for your conference.[ Previous | Next | ADS  ]Optical outburst of the B[e]/X-Ray system CI Cam/XTEJ0421+560ATel #9634; M. J.P. Wijngaarden (University of Amsterdam), K. Gourdji (University ofAmsterdam), L. C. Oostrum (ASTRON/University of Amsterdam), H. F. Henrichs (Universityof Amsterdam)on 16 Oct 2016; 00:41 UTDistributed as an Instant Email Notice TransientsCredential Certification: Huib Henrichs (h.f.henrichs@uva.nl)Subjects: Radio, Far-Infra-Red, Infra-Red, Optical, Ultra-Violet, X-ray, Gamma Ray, Request forObservations, Binary, Black Hole, Nova, Neutron Star, Star, Transient, VariablesReferred to by ATel #: 9639, 9663We report a very strong optical outburst of the B[e]/transient X-ray system CI Cam/XTEJ0421+560. On 2016 Oct 09.064 we measured H alpha at 80 times the continuum flux level,similar to the previous reported outbursts in 1998 (Hynes et al., 2002) and 2005 (Yan et al.,2007). Our spectroscopic observations ranging from 3800 - 8900 A (Mercator/HERMES, LaPalma) from 09 - 15 October show a daily increase in the strength of nearly all emission lineswith the notable exception of [NII] 5755. Further multi-wavelength observations are strongly encouraged as the outburst closely resemblesthe spectacular outburst in 1998 over the complete wavelength range from gamma-ray to radio.At that epoch the X-ray flux reached a peak intensity of almost 2 crab, within a day after the onset(D. Smith et al., 1998). In 2005 the peak brightness reached V = 11.2 after which it rapidlydeclined in a few months to V = 11.8. Now the highly disputed distance to CI Cam is settled by GAIA at 1.4 (+0.7 -0.4) kpc, we notethat CI Cam is unlikely a supergiant. This confirms the earlier designation as B4 III-V[e] for theoptical star with an accreting white dwarf companion as suggested by Barsukova et al. (2006).The likely scenario would be a thermonuclear runaway of accreted matter on the surface of thewhite dwarf, like in a nova outburst (Ishida et al., 2004).Related12097 B[e] star CI Cam is pulsing ina single mode now9663 CI Cam/XTE J0421+560resides in optical active statesince 20139639 No detected increase in theX-ray activity of B[e]/X-Raysystem CI Cam/XTEJ0421+5609634 Optical outburst of theB[e]/X-Ray system CICam/XTE J0421+5601381 The nature of the rapidvariability of CI Cam (XTEJ0421+ 560)1036 Discovery of the accelerationin the wind emission lines ofCI Cam820 Periodicity in XTEJ0421+560/CI Cam416 The orbital period of CI Cam(XTE J0421+560)ATel #9634: Optical outburst of the B[e]/X-Ray system CI Cam/XTE J0421+560http://www.astronomerstelegram.org/?read=9634[5-6-2020 11:02:12][ Telegram Index ]R. E. Rutledge, Editor-in-ChiefDerek Fox, EditorMansi M. Kasliwal, Co-Editor

Optical outburst of the B[e]/X-Ray system CI Cam/XTE J0421+560

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Optical outburst of the B[e]/X-Ray system CI Cam/XTE J0421+560

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