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Suhail al Muhlif

HIP 39953; Gamma2 Vel

Estrela Dupla Observável Excelente (64/100)

Sep: 41.2", Companion: mag 4.1

HIP 39953; Gamma2 Vel DoubleStar Vel Visível Nível 2 Small telescope (4") - Requires steady seeing
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Propriedades Físicas

Magnitude 1.78
Intervalo 1.81 - 1.87
Período 78.530 dias
Tipo de Variável Wolf-Rayet Variable
Tipo Espectral WC 8
Cor da Estrela Azul (B-V -0.22)
Distância 1256.8 ly

Posição e Identificadores

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

Visibilidade

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Curva de Luz

Sistema Estelar Múltiplo

Componentes 5
IDs dos Componentes AB
Separação 41.2″
Mag da Companheira 4.1
Espectro da Companheira O9I
Ângulo de Posição 221°
Cores das Estrelas A: Azul B: Azul
Descobridor DUN 65

Vista pela Ocular

80x Dawes: 1.9″ TFOV: 0.6°
Realista = tamanho angular verdadeiro
N E 221° A (1.8) B (4.1)

Sep: 41.2″ · PA: 221° · N cima, L esquerda

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

Comparação de Tamanho

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Ciclo de vida estelar

Classificação Espectral

Diagrama Hertzsprung-Russell

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Espectro de corpo negro

Espectro de absorção estelar

Espectro de absorção simulado com base no tipo espectral. Passe o mouse sobre as linhas para identificar os elementos.

Notas Estelares

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".

Imagem de Levantamento

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Sobre Suhail al Muhlif

Descrição

Regor (also called Suhail al Muhlif) is one of the most remarkable star systems visible to the naked eye at magnitude 1.78. The primary is a Wolf-Rayet star (spectral type WC8) in a binary with an O9 supergiant, located about 1,100 light-years away. Wolf-Rayet stars 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.

Dicas de Observação

Gamma Vel lies in the rich Milky Way fields of Vela and is one of the finest wide double stars in the sky — a small telescope reveals a brilliant pair of blue-white stars separated by about 41 arcseconds. The surrounding star field is gorgeous in binoculars. Visible from the southern hemisphere and low northern latitudes. Best observed February through May.

História

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 stars identified, and its extreme spectral features have made it a prototype for studying massive stellar evolution.

Curiosidades

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.