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Suhail al Muhlif

HIP 39953; Gamma2 Vel

Beobachtbarer Doppelstern Hervorragend (64/100)

Sep: 41.2", Companion: mag 4.1

HIP 39953; Gamma2 Vel DoubleStar Vel Sichtbar Stufe 2 Small telescope (4") - Requires steady seeing
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Physikalische Eigenschaften

Helligkeit 1.78
Bereich 1.81 - 1.87
Periode 78.530 Tage
Variablentyp Wolf-Rayet Variable
Spektraltyp WC 8
Sternfarbe Blau (B-V -0.22)
Entfernung 1256.8 ly

Position & Bezeichnungen

RA 08h 09m 32.0s
Dec -47° 20' 12.0"
Sternbild Vel
HR 3207
HIP 39953
Bayer Gamma2
Variable ID Gam2 Vel

Sichtbarkeit

Standort in den Benutzereinstellungen festlegen um Sichtbarkeitsdaten zu sehen.

Lichtkurve

Mehrfachsternsystem

Komponenten 5
Komponenten-IDs AB
Abstand 41.2″
Begleiter-Mag 4.1
Begleiter-Sp O9I
Positionswinkel 221°
Sternfarben A: Blau B: Blau
Entdecker DUN 65

Okularansicht

80x Dawes: 1.9″ TFOV: 0.6°
Realistisch = wahrer Winkelabstand
N E 221° A (1.8) B (4.1)

Sep: 41.2″ · PA: 221° · N oben, O links

Aufgelöst · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″

Größenvergleich

VizieR wird nach Sterndaten abgefragt…

Sternentwicklung

Spektralklassifikation

Hertzsprung-Russell-Diagramm

HR-Diagramm wird geladen…

Schwarzkörperspektrum

Stellares Absorptionsspektrum

Simuliertes Absorptionsspektrum basierend auf dem Spektraltyp. Bewegen Sie die Maus über die Linien, um die Elemente zu identifizieren.

Sternanmerkungen

1.6 - 1.8V, 154 sec. Sp. var. in about 200 sec. Variability too great to be explained by the 78.5d SB companion. | Possibly a third close companion: a collapsed star of less than 2 solar masses.
See HR 3206. Mag. and colors blended with other companions. C = CoD -46d3848, 7.65V, B6V at 63", physical. D, 9.07V, | Am at 94", SB, over 7d?, optical.
Comp. A of visual double, 78.5d, K 43.1k/s, V0 -18.0k/s, asini 45.8. Alternate orbit 78.5002d, K 70k/s, | V0 +12k/s, msin3i 32, asini 67. Possible mass transfer from WR to O-type component.
Gamma Velorum group which includes HR 3206, probably also HD 68157 at 20' and HR 3213 at 36' from A; HII region.
Magnesium and iron depleted by factor of 100 relative to the sun. UV spectrum dominated by supergiant companions. The | Wolf-Rayet component appears to be the most massive known. Radio emission indicates a circumstellar gas cloud extending | beyond the orbit of the binary. Also classified WC8+O7.5e.
Suhail al Muhlif; Al Suhail al Muhlif; "Spectral Gem of Southern Skies".
Diam. = 0.00043 - 0.00044".

Durchmusterungsbild

Durchmusterungsbild wird geladen…

Über Suhail al Muhlif

Beschreibung

Regor (also called Suhail al Muhlif) is one of the most remarkable star systems mit bloßem Auge sichtbar at magnitude 1.78. The primary is a Wolf-Rayet-Stern (Spektraltyp WC8) in a binary with an O9 supergiant, located about 1,100 Lichtjahre entfernt. Wolf-Rayet-Sterns are extremely hot, massive stars that are blowing off their outer layers in powerful stellar winds at thousands of km/s, exposing their helium-burning cores.

Beobachtungstipps

Gamma Vel lies in the rich Milchstraße fields des Sternbilds Segel and is one of the finest wide Doppelsterns in the sky — a kleines Teleskop reveals a brilliant pair of blue-white stars separated by about 41 Bogensekunden. The surrounding star field is gorgeous in Fernglas. Visible from the Südhalbkugel and low nördlichen Breiten. Best observed Februar through Mai.

Geschichte

The informal name Regor (Roger spelled backwards) was a joke by Apollo 1 astronaut Gus Grissom, honoring crewmate Roger Chaffee. The name stuck in some usage. Gamma Vel was one of the first Wolf-Rayet-Sterns identified, and its extreme spectral features have made it a prototype for studying massive stellar evolution.

Wissenswertes

The Wolf-Rayet component of Gamma Vel is losing mass at an extraordinary rate — shedding roughly one Earth mass per year through its fierce stellar wind. This wind collides with the O-star companion's wind, creating a cone of shocked, superheated gas that emits X-rays. The star is a supernova candidate.