V419 Cephei

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V419 Cephei

A light curve for V419 Cephei, plotted from Hipparcos data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension 21h 12m 47.24741s[2]
Declination +60° 05′ 52.8017″[2]
Apparent magnitude (V) 6.54 - 6.89[3]
Characteristics
Evolutionary stage Red supergiant
Spectral type M2 Ib[4]
Variable type Lc[3]
Distance
1,085[6] pc
Absolute magnitude (MV)−5.72[7]
Details
Myr
BD+59°2342, AG+59 1417, GCRV
 13343
Database references
SIMBADdata

V419 Cephei (BD+59°2342 or HIP 104719) is an irregular variable star in the constellation of Cepheus with an apparent magnitude that varies between 6.54 and 6.89.

Distance

The

Gaia Data Release 2 parallax of 1.0342±0.1022 mas is consistent with this distance.[5] It is a member of the stellar association Cepheus OB2-A.[6]

Characteristics

V419 Cephei is a

M2 Ib with an effective temperature around 3,700 K and an estimated radius of 533 R☉. The K-band angular diameter measurements equal 5.90 ± 0.70 milliarcseconds,[10] which leads to a figure not much higher, although the uncertainty in its distance must also be taken into account. If placed at the Sun's location, it would engulf the orbits of Mercury, Venus, Earth, Mars, and roughly half of the asteroid belt
.

V419 Cephei has a mass 16.6 solar masses, above the limit beyond which stars end their lives as supernovae. The life of such massive stars is very short. Despite its advanced evolutionary state, V419 Cephei is only 10 million years old.[8]

Billed as an irregular variable star of type LC, V419 Cephei's brightness varies between magnitudes 6.54 and 6.89 with no apparent periodicity.[3]

References

  1. ^ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
  2. ^
    S2CID 18759600
    .
  3. ^
    Bibcode:2009yCat....102025S
    .
  4. S2CID 123149047
    .
  5. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  6. ^
    doi:10.1051/0004-6361:20041272
    . pp. 165-186.
  7. S2CID 15109583
    .
  8. ^
    S2CID 118629873
    .
  9. ^
    S2CID 148571616
    .
  10. doi:10.1051/0004-6361:20042039
    . pp. 773-777.
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