WR 69
star in the constellation Triangulum Australe
WR 69 is a Wolf–Rayet star located about 9,000 light years away in the constellation of Triangulum Australe. It is classified as a WC9 star, belonging to the late-type carbon sequence. WR 69 is also a prolific dust producer, hence the "d" in its spectral type.
Binarity
WR 69 has generally been considered to be a binary (WC9d + O) star, with a period of 2.293 days and an amplitude of 0.044 magnitudes, suggesting it could be a short period colliding-wind binary. However, this periodicity is not due binary motion, but due to the fast rotation of the WC9d star, which rotates once every 2.15 days, at 40% of its breakup velocity. The WC9d star is likely part of a much longer binary system, hence the absorption lines found in its spectrum.
Properties
WR 69 is quite average for a WC9 star. Modelling WR 69's spectrum gives a temperature of 40,000 K, and a luminosity of ~214,000 L☉ is derived from the Gaia DR2 parallax. From this a radius can be derived using the Stefan-Boltzmann Law, which turns out at just under 10 R☉. However, in the visual wavelength, the star is just 13,600 L☉ bright, because most of the 214,000 L☉ is emitted in the ultraviolet wavelength.
The public source identifies “WR 69” as star in the constellation Triangulum Australe. This brief keeps that definition visible, then builds a research path around star, constellation and Triangulum.
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This entry incorporates text from “WR 69” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.