56 Leonis

{{Starbox image

| image=

{{Location mark

|image=Leo constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=8|mark_link=56 Leo

|x=442|y=770

}}

|caption=Location of 56 Leonis (circled)

}}

{{Starbox observe

| epoch = J2000.0

| constell = Leo

| ra={{RA|10|56|01.4690}}

| dec={{DEC|+06|11|07.328}}

| appmag_v = 5.69{{snd}}6.03

}}

{{Starbox character

| type = red giant

| class = M5.5III

| r-i =

| v-r =

| b-v =

| u-b =

| variable = LB?

}}

{{Starbox astrometry

| prop_mo_ra = −23.90

| prop_mo_dec = −6.42

| parallax = 8.39

| p_error = 0.37

| parallax_footnote =

| dist_ly =

| dist_pc =

}}

{{Starbox detail

| mass = 1.1

| radius = 192

| luminosity = 1,479

| temperature = 3,279

| gravity = 0.64

| metal_fe = +0.45

}}

{{Starbox catalog

| names = {{odlist | F=56 Leo | V=VY Leo | HIP=53449 | HD=94705 | HR=4267 | BD=+06°2469 }}

}}

{{Starbox reference

|Simbad=56+Leo

}}

56 Leonis is a red giant variable star located approximately 390 light years away in the constellation Leo.

File:VYLeoLightCurve.png for VY Leonis, plotted from Hipparcos data]]

The apparent magnitude of 56 Leonis varies between 5.69 and 6.03, making it dimly visible to the naked eye, and it has been given the variable star designation VY Leo. The type of variability is uncertain. The General Catalogue of Variable Stars suggests it may be a slow irregular variable, but some sources have found periods and report it as semiregular.

The spectral class of 56 Leonis is M5.5III, indicating a cool red giant star that has exhausted the supply of hydrogen at its core and evolved away from the main sequence. It is undecided whether it is currently on the red giant branch or asymptotic giant branch. The star has an estimated 1.1 times the mass of the Sun but has expanded to 192 times the Sun's radius. The star is radiating 1,479 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,279 K.

References

{{Reflist|refs=

{{cite web |title=Light Curve |url=https://www.cosmos.esa.int/web/hipparcos/java-tools/light-curve |website=Hipparcos ESA |publisher=ESA |access-date=30 September 2022}}

{{cite web |url=https://www.aavso.org/vsx/index.php?view=detail.top&oid=17074 |title=VY Leonis |publisher=AAVSO |website=International Variable Star Index |access-date=2022-09-29 }}

{{cite journal |bibcode=2019A&A...628A..94A |title=Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18 |last1=Anders |first1=F. |last2=Khalatyan |first2=A. |last3=Chiappini |first3=C. |last4=Queiroz |first4=A. B. |last5=Santiago |first5=B. X. |last6=Jordi |first6=C. |last7=Girardi |first7=L. |last8=Brown |first8=A. G. A. |last9=Matijevič |first9=G. |last10=Monari |first10=G. |last11=Cantat-Gaudin |first11=T. |last12=Weiler |first12=M. |last13=Khan |first13=S. |last14=Miglio |first14=A. |last15=Carrillo |first15=I. |last16=Romero-Gómez |first16=M. |last17=Minchev |first17=I. |last18=De Jong |first18=R. S. |last19=Antoja |first19=T. |last20=Ramos |first20=P. |last21=Steinmetz |first21=M. |last22=Enke |first22=H. |journal=Astronomy and Astrophysics |year=2019 |volume=628 |pages=A94 |doi=10.1051/0004-6361/201935765 |arxiv=1904.11302 |s2cid=131780028 }}

{{cite journal |bibcode=2019ApJ...886..117L |title=Carbon and Oxygen Isotopic Ratios. II. Semiregular Variable M Giants |last1=Lebzelter |first1=Thomas |last2=Hinkle |first2=Kenneth H. |last3=Straniero |first3=Oscar |last4=Lambert |first4=David L. |last5=Pilachowski |first5=Catherine A. |last6=Nault |first6=Kristie A. |journal=The Astrophysical Journal |year=2019 |volume=886 |issue=2 |page=117 |doi=10.3847/1538-4357/ab4e9b |arxiv=1912.04386 |s2cid=209140544 |doi-access=free }}

{{cite journal

| first=F. | last=van Leeuwen

| title=Validation of the new Hipparcos reduction

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–664

| date=November 2007 | bibcode=2007A&A...474..653V

| doi=10.1051/0004-6361:20078357

| arxiv=0708.1752

| s2cid=18759600

}}

{{cite journal

| display-authors=1 | last1=Samus | first1=N. N.

| last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.

| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.

| title=General Catalogue of Variable Stars

| version=5.1 | journal=Astronomy Reports

| year=2017 | volume=61 | issue=1 | pages=80–88

| bibcode=2017ARep...61...80S | s2cid=125853869

| doi=10.1134/S1063772917010085 }}

{{cite journal |bibcode=2022A&A...657A...7K |title=Stellar and substellar companions from Gaia EDR3. Proper-motion anomaly and resolved common proper-motion pairs |last1=Kervella |first1=Pierre |last2=Arenou |first2=Frédéric |last3=Thévenin |first3=Frédéric |journal=Astronomy and Astrophysics |year=2022 |volume=657 |page=657 |doi=10.1051/0004-6361/202142146 |arxiv=2109.10912 |s2cid=237605138 }}

{{cite journal|bibcode=2018MNRAS.481.4984M|title=Pulsation-triggered dust production by asymptotic giant branch stars|journal=Monthly Notices of the Royal Astronomical Society|volume=481|issue=4|pages=4984|last1=McDonald|first1=I.|last2=De Beck|first2=E.|last3=Zijlstra|first3=A. A.|last4=Lagadec|first4=E.|year=2018|arxiv=1809.07965|doi=10.1093/mnras/sty2607|doi-access=free |s2cid=118969263}}

}}

Category:Leo (constellation)

Leonis, VY

094706

4267

Category:M-type giants

053449

Category:Durchmusterung objects